Đáp án:
$\frac{2}{3}$ . x - $\frac{1}{4}$ = $\frac{-2}{3}$
$\frac{2}{3}$ . x = $\frac{-2}{3}$ + $\frac{1}{4}$
$\frac{2}{3}$ . x = $\frac{-8}{12}$ + $\frac{3}{12}$
$\frac{2}{3}$ . x = $\frac{-5}{12}$
x = $\frac{-5}{12}$ : $\frac{2}{3}$
x = $\frac{-5}{12}$ . $\frac{3}{2}$
x = $\frac{-15}{24}$ = $\frac{-5}{8}$
Vậy x = $\frac{-5}{8}$
________________
$\frac{7}{4}$ + x = $\frac{5}{6}$
x = $\frac{5}{6}$ - $\frac{7}{4}$
x = $\frac{10}{12}$ - $\frac{21}{12}$
x = $\frac{-11}{12}$
Vậy x = $\frac{-11}{12}$
