Помогите решить примеры

Решите задачу:

$1) \frac{5x \times 4 - 3 \times (2 - 3x)}{12} = \\ \frac{20x - 6 + 9x}{12} = \frac{29x - 6}{12}$
$2)3(m + 4) - 2(4m + 1) = 0 \\ 3m + 12 - 8m - 2 = 0 \\ - 5m + 10 = 0 \\ - 5m = 0 - 10 = - 10 \\ m = - 10 \div$
$m = - 10 \div ( - 5) = 2$
$3)m - 1 + 2(1 - 2m) = 0 \\ m - 1 + 2 - 4m = 0 \\ - 3m + 1 = 0 \\3 m = 0 - 1 = - 1 \\ m = - 1 \div ( - 3) = \frac{?}{?}$
$m = - 1 \div 3 = - \frac{1}{3}$