1. Решите уравнения: a) 6x-2(2x + 5) = 18: 6) 5(3y-2)-4y = 34; в) 3(2а +7)5(a-1) = 38; r) 8(b3)-2(3b+1)=20.

1. Решение уравнений:

1. a) \( 6x - 2(2x + 5) = 18 \)
   \( 6x - 4x - 10 = 18 \)
   \( 2x = 28 \)
   \( x = 14 \)
2. б) \( 5(3y - 2) - 4y = 34 \)
   \( 15y - 10 - 4y = 34 \)
   \( 11y = 44 \)
   \( y = 4 \)
3. в) \( 3(2a + 7) - 5(a - 1) = 38 \)
   \( 6a + 21 - 5a + 5 = 38 \)
   \( a + 26 = 38 \)
   \( a = 12 \)
4. г) \( 8(b - 3) - 2(3b + 1) = 20 \)
   \( 8b - 24 - 6b - 2 = 20 \)
   \( 2b - 26 = 20 \)
   \( 2b = 46 \)
   \( b = 23 \)

Ответ: а) x = 14; б) y = 4; в) a = 12; г) b = 23.