Question

A/5a-7b*(7/a-5/b) help me

Answer 1

$\frac{a}{5a} - 7b \times ( \frac{7}{a} - \frac{5}{b}) = \\ 1) \frac{7b - 5a}{ab} \\ 2) - \frac{7b}{1} \times \frac{(7b - 5a)}{ab} = - \frac{7b(7b - 5a) }{ab} \\3) \frac{ab}{5ab} - \frac{5( 7b(7b - 5a ))}{5ab} = \frac{ab - 35b(7b - 5a)}{5ab} = \frac{(a - 35)(7b - 5a)}{5a} =$