Đáp án:
$x$ : $\frac{3}{10}$+$x$.$\frac{7}{2}$ = $-5$$\frac{4}{5}$
$x$.$\frac{10}{3}$+$x$.$\frac{7}{2}$ = $-5$$\frac{4}{5}$
$x$.($\frac{10}{3}$+$\frac{7}{2}$) = $-5$$\frac{4}{5}$
$x$.($\frac{20}{6}$+$\frac{21}{6}$) = $-5$$\frac{4}{5}$
$x$.$\frac{41}{6}$ = $-5$$\frac{4}{5}$
$x$.$\frac{41}{6}$ = $\frac{-21}{5}$
$x$ = $\frac{-21}{5}$ : $\frac{41}{6}$
$x$ = $\frac{-21}{5}$ . $\frac{6}{41}$
$x$ = $\frac{-126}{205}$
Vậy $x$ = $\frac{-126}{205}$
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