ЗАДАНИЕ 6. Реши уравнения.

Решение:

1. \( 7 \cdot 7 - (7 \cdot 9 - 19) + a \cdot 4 = 29 \)

\( 49 - (63 - 19) + 4a = 29 \)

\( 49 - 44 + 4a = 29 \)

\( 5 + 4a = 29 \)

\( 4a = 29 - 5 \)

\( 4a = 24 \)

\( a = \frac{24}{4} \)

\( a = 6 \)

2. \( (8 \cdot 7 - 63 : 9) : a = 55 - 6 \cdot 8 \)

\( (56 - 7) : a = 55 - 48 \)

\( 49 : a = 7 \)

\( a = \frac{49}{7} \)

\( a = 7 \)

Ответ: \( a = 6 \) и \( a = 7 \).