x - (25%)² . x = $\frac{1}{2}$ - 1$\frac{3}{4}$
x - ($\frac{1}{4}$)² . x = $\frac{1}{2}$ - $\frac{7}{4}$
x - $\frac{1}{16}$ . x = $\frac{4}{8}$ - $\frac{14}{8}$
x . (1 - $\frac{1}{16}$) = $\frac{-5}{4}$
x . $\frac{15}{16}$ = $\frac{-5}{4}$
x = $\frac{-5}{4}$ : $\frac{15}{16}$
x = $\frac{-4}{3}$
Vậy x = $\frac{-4}{3}$
(1,4 . x - 6) : $\frac{2}{3}$ = -3 - 1$\frac{1}{5}$
($\frac{7}{5}$ . x - 6) : $\frac{2}{3}$ = -3 - $\frac{6}{5}$
($\frac{7}{5}$ . x - 6) : $\frac{2}{3}$ = $\frac{-21}{5}$
$\frac{7}{5}$ . x - 6 = $\frac{-21}{5}$ . $\frac{2}{3}$
$\frac{7}{5}$ . x - 6 = $\frac{-14}{5}$
$\frac{7}{5}$ . x = $\frac{-14}{5}$ + 6
$\frac{7}{5}$ . x = $\frac{16}{5}$
x = $\frac{16}{5}$ : $\frac{7}{5}$
x = $\frac{16}{7}$
Vậy x = $\frac{16}{7}$
