Question

решите уравнение
6 - x/3 = x/7

Answer 1

$6- frac{x}{3} = frac{x}{7}$
$frac{x}{7}+ frac{x}{3}=6$
$frac{3x}{21} + frac{7x}{21}=6$
$frac{10x}{21}=6$
$x=6*21:10$
$x=12 frac{3}{5}$