9.

(9x + 42) - 5x = - 70

x = - 28

Step-by-step explanation:

(9x+42) - 5x = - 70

add 5x to both sides

9x + 42 = - 70 + 5x

subtract 42 from each side

9x = - 112 + 5x

subtract 5x from each side

4x = - 112

Divide each side by 4

x = - 28

X = - 28

(9x+42) - 5x=-70

9x+-5x+-5x=-70

(9x+-5x) + (42) = -70

4x+42=-70

4x+42=-70

4x+42-42=-70-42

4x=-112

4x/4=-112/4

x=-28