Question

пожалуйста!!!!!!!!!!​

Answer 1

Ответ:

$7) \: \: \: \: 5 - 3(2 - 3x) = - 3 - x \\ 5 - 6 + 9x = - 3 - x \\ 9x + x = - 3 + 6 - 5 \\ 10x = - 2 \\ x = - 0.2$

$8) \: \: \: - \frac{3}{5} (2x - \frac{2}{3} ) = - \frac{1}{5}x - \frac{3}{5} \\ - \frac{6}{5} x + \frac{2}{5} = - \frac{1}{5}x - \frac{3}{5} \\ - \frac{6}{5} x + \frac{1}{5} x = - \frac{3}{5} - \frac{2}{5} \\ - x = - 1 \\ x = 1$

$9) \: \: \: 4( \frac{3}{4 } - 6x) = - 12(2x + \frac{1}{4} ) + 6 \\ 3 - 24x = - 24x - 3 + 6 \\ - 24x + 24x = 6 - 3 - 3 \\ 0 = 0$