Question

только первый номер​

Answer 1

$a) \: - 1.3 + (x - 4.8) = - 7.1 \\ - 1.3 + x - 4.8 = - 7.1 \\ x = - 7.1 + 6.1 \\ x = - 1$

$b) \: - \frac{5}{7} - (m - 1) = \frac{11}{14} \\ - \frac{5}{7} - m + \frac{7}{7} = \frac{11}{14} \\ - m = \frac{11}{14} - \frac{2}{7} \\ - m = \frac{11 - 4}{14} \\ - m = \frac{7}{14} \\ m = - \frac{1}{2}$