Question

Solve for $-x$:
$\frac{5}{x}=\frac{7}{x-4}$

Answer 1

$\frac{5}{x}$ $=$ $\frac{7}{x-4}$

$Cross$ $multiplying,$

$5(x-4)=7x$

$5x-20=7x$

$2x=-20$

$x=-10$