Сократить дробь:помогите пж быстро

$a) \frac{16x}{4} = 4x$
$\frac{10}{15m} = \frac{2}{3m}$
$\frac{3x}{2ax} = \frac{3}{2a}$
б)
$\frac{9 {ab}^{2} }{9ab} = b$
$\frac{abc}{ {a}^{2} {c}^{2} } = \frac{b}{ac}$
$\frac{18 {m}^{2}n }{16 {mn}^{2} } = \frac{9m}{8n}$
в)
$\frac{2a - 4}{8a} = \frac{2(a - 2)}{8a} = \frac{a - 2}{4a}$
$\frac{3x + 3y}{3x - 3y} = \frac{3(x + y)}{3(x - y)} = \frac{x + y}{x - y}$
$\frac{5p - 5q}{3p - 3q} = \frac{5(p - q)}{3(p - q)} = \frac{5}{3} = 1 \frac{2}{3}$