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5x − 3 = 12
5x = 12 + 3
5x = 15
x = 15 / 5
Ответ: x = 3
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2(x + 4) = 3x − 1
2x + 8 = 3x − 1
3x - 2x = 8 + 1
x = 9
Ответ: x = 9
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x/5 + 2 = 7
x/5 = 7 − 2
x/5 = 5
x = 5 \times 5
Ответ: x = 25
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4(2 – x) = 3x + 5
8 − 4x = 3x + 5
3x + 4x = 8 − 5
7x = 3
x = 3/7
Ответ: x = 3/7
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(3x − 2)/4 = x/2
3x − 2 = 2x
3x − 2x = 2
x = 2
Ответ: x = 2
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0.5x + 1.2 = 3.7
0.5x = 3.7 − 1.2
0.5x = 2.5
x = 2.5 / 0.5
Ответ: x = 5
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2x + x/3 = 14
(6x + x)/3 = 14
7x = 14 \times 3
7x = 42
x = 42 / 7
Ответ: x = 6
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5/x = 2/7
2x = 5 \times 7
2x = 35
x = 35/2
Ответ: x = 35/2 = 17.5
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(x + 1)/3 − (x − 2)/4 = 1
[4(x + 1) − 3(x − 2)]/12 = 1
4x + 4 − 3x + 6 = 12
x + 10 = 12
x = 12 − 10
Ответ: x = 2
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3(x − 1) = 2(x + 3) − x
3x − 3 = 2x + 6 − x
3x − 3 = x + 6
3x − x = 6 + 3
2x = 9
Ответ: x = 9/2 = 4.5
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x² − 16 = 0
x² = 16
x = \pm \sqrt{16}
Ответ: x = 4, x = -4
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3x² + 7x = 0
x(3x + 7) = 0
x = 0 или 3x + 7 = 0
3x = -7
x = -7/3
Ответ: x = 0, x = -7/3
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2x² − 8 = 0
2x² = 8
x² = 4
x = \pm \sqrt{4}
Ответ: x = 2, x = -2
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x² + 5x + 6 = 0
D = 5² − 4 \cdot 1 \cdot 6 = 25 − 24 = 1
x = (-5 \pm \sqrt{1}) / 2
x = (-5 \pm 1) / 2
x₁ = (-5 + 1) / 2 = -2
x₂ = (-5 − 1) / 2 = -3
Ответ: x = -2, x = -3
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4x² − 12x + 9 = 0
D = (-12)² − 4 \cdot 4 \cdot 9 = 144 − 144 = 0
x = 12 / (2 \cdot 4) = 12 / 8 = 3/2
Ответ: x = 3/2 = 1.5
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x² − x − 6 = 0
D = (-1)² − 4 \cdot 1 \cdot (-6) = 1 + 24 = 25
x = (1 \pm \sqrt{25}) / 2
x = (1 \pm 5) / 2
x₁ = (1 + 5) / 2 = 3
x₂ = (1 − 5) / 2 = -2
Ответ: x = 3, x = -2
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5x² + 2x − 3 = 0
D = 2² − 4 \cdot 5 \cdot (-3) = 4 + 60 = 64
x = (-2 \pm \sqrt{64}) / (2 \cdot 5)
x = (-2 \pm 8) / 10
x₁ = (-2 + 8) / 10 = 6 / 10 = 3/5
x₂ = (-2 − 8) / 10 = -10 / 10 = -1
Ответ: x = 3/5 = 0.6, x = -1
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(x − 3)² = 25
x − 3 = \pm \sqrt{25}
x − 3 = \pm 5
x = 3 \pm 5
x₁ = 3 + 5 = 8
x₂ = 3 − 5 = -2
Ответ: x = 8, x = -2
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x² + 4x = 5
x² + 4x − 5 = 0
D = 4² − 4 \cdot 1 \cdot (-5) = 16 + 20 = 36
x = (-4 \pm \sqrt{36}) / 2
x = (-4 \pm 6) / 2
x₁ = (-4 + 6) / 2 = 1
x₂ = (-4 − 6) / 2 = -5
Ответ: x = 1, x = -5
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2x² − 5x + 2 = 0
D = (-5)² − 4 \cdot 2 \cdot 2 = 25 − 16 = 9
x = (5 \pm \sqrt{9}) / (2 \cdot 2)
x = (5 \pm 3) / 4
x₁ = (5 + 3) / 4 = 2
x₂ = (5 − 3) / 4 = 1/2
Ответ: x = 2, x = 1/2 = 0.5