Đáp án:
$\text{$\dfrac{1}{2}$x - $\dfrac{3}{4}$ = $\dfrac{-11}{4}$}$
$\text{<=> $\dfrac{1}{2}$x = $\dfrac{-11}{4}$ + $\dfrac{3}{4}$ }$
$\text{<=> $\dfrac{1}{2}$x= -2 }$
$\text{<=> x = -2 : $\dfrac{1}{2}$ }$
$\text{<=> x =-4 }$
$\text{Vậy x = -4}$
$\text{ $\dfrac{3}{2}$ - $\dfrac{1}{2}$ : x = $\dfrac{5}{4}$ }$
$\text{<=> $\dfrac{-1}{2}$ : x = $\dfrac{5}{4}$ - $\dfrac{3}{2}$ }$
$\text{<=> $\dfrac{-1}{2}$ : x =$\dfrac{-1}{4}$ }$
$\text{<=> x = $\dfrac{-1}{2}$ : $\dfrac{-1}{4}$ }$
$\text{<=>x = 2 }$
$\text{ Vậy x= 2 }$
$\text{$\dfrac{1}{3}$ + $\dfrac{2}{3}$x -7 =0}$
$\text{<=> $\dfrac{2}{3}$x = 7 - $\dfrac{1}{3}$ }$
$\text{<=> $\dfrac{2}{3}$x = $\dfrac{20}{3}$ }$
$\text{<=> x = $\dfrac{20}{3}$ : $\dfrac{2}{3}$ }$
$\text{<=> x = 10 }$
$\text{Vậy x= 10 }$
