A/$\frac{x}{5}$ = $\frac{2}{3}$
⇔ 3x = 10
⇔ x = $\frac{10}{3}$
B/ $\frac{x}{3}$ - $\frac{1}{2}$ = $\frac{1}{5}$
⇔$\frac{x}{3}$ = $\frac{7}{10}$
⇔ 10x = 21
⇔ x = $\frac{21}{10}$
C/ $\frac{x}{5}$ + $\frac{1}{2}$ = $\frac{6}{10}$
⇔$\frac{x}{5}$ = $\frac{1}{10}$
⇔ 10x = 5
⇔ x = $\frac{1}{2}$
$chomikxinctlhnnha$