5/6.x-3/8=-7/12 ta phỉa tìm x

 $\dfrac{5}{6} . x - \dfrac{3}{8} = \dfrac{-7}{12}$

 $\dfrac{5}{6} . x = \dfrac{3}{8} + \dfrac{-7}{12}$

 $\dfrac{5}{6} . x = \dfrac{-20}{96}$

 $x = \dfrac{-20}{96} : \dfrac{5}{6}$

 $x = \dfrac{-20}{80} = \dfrac{-1}{4}$