Đáp án:
a)
x-$\frac{3}{4}$ =1
=>x = 1 + $\frac{3}{4}$
=>x = $\frac{7}{2}$
Vậy x ={$\frac{7}{2}$}
b)
x +$\frac{-3}{7}$ = $\frac{4}{7}$
=>x = $\frac{4}{7}$ + $\frac{3}{7}$
=>x =1
Vậy x={1}
c)
$\frac{3}{2}$.x = $\frac{-2}{3}$
=>x = $\frac{-2}{3}$ : $\frac{3}{2}$
=> x = $\frac{-4}{9}$
Vậy x ={ $\frac{-4}{9}$}
d)
$\frac{2}{5}$ + $\frac{3}{5}$ .x = $\frac{-1}{4}$
=> $\frac{3}{5}$x= $\frac{-1}{4}$ -$\frac{2}{5}$
=>$\frac{3}{5}$x = $\frac{-13}{20}$
=> x = $\frac{-13}{20}$ : $\frac{3}{5}$
=>x = $\frac{-13}{12}$
Vậy x = { $\frac{-13}{12}$}
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