СРОЧНО Помогите решить уравнения под цифрами 2),4)

Здравствуй.

2)
$3 - ( \frac{2}{9} m + \frac{1}{6} ) = \frac{m}{3} + 1.5 \\ \\ 3 - \frac{2}{9} m - \frac{1}{6} = \frac{1}{3} m + 1.5 \\ \\ 2 \frac{5}{6} - \frac{2}{9} m = \frac{3}{9} m + 1.5 \\ \\ - \frac{2}{9} m - \frac{3}{9} m = 1 \frac{5}{10} - 2 \frac{5}{6} \\ \\ - \frac{5}{9} m = 1\frac{15}{30} - 2 \frac{25}{30} \\ \\ - \frac{5}{9} m = - 1 \frac{10}{30} \\ \\ - \frac{5}{9} m = - 1 \frac{1}{3} \\ \\ m = \frac{4 \times 9}{3 \times 5} \\ \\ m = \frac{12}{5} \\ \\ m = 2.4$

4)
$\frac{2}{15} (b + 5) - \frac{3}{10} (5b - 1) = 4 \\ \\ \frac{2}{15} b + \frac{2}{3} - 1.5b + 0.3 = 4 \\ \\ \frac{4}{30} b - \frac{45}{30} b = 4 - 0.3 - \frac{2}{3} \\ \\ - \frac{41}{30} b = 3 \frac{1}{30} \\ \\ b = - \frac{91 \times 30}{30 \times 41} \\ \\ b = - \frac{91}{41} \\ \\ b = - 2 \frac{9}{41}$

удачи в учебе.