Question

7+$frac{x}{10}$=$frac{x+9}{5}$

Answer 1

$7+ frac{x}{10} = frac{x+9}{5}$
$frac{70+x}{10} = frac{x+9}{5}$
5(70+x)=10(x+9)
350+5x=10x+90
-5x=-260
x=52
Ответ: 52