Tìm x biết ​(begin{array}{I} frac{{ – 3}}{5} + x – frac{1}{5} = frac{{ – 3}}{2} end{array} )

Ta có:

(begin{array}{I} frac{{ – 3}}{5} + x – frac{1}{5} = frac{{ – 3}}{2}\ x – left( {frac{3}{5} + frac{1}{5}} right) = frac{{ – 3}}{2}\ x – frac{4}{5} = frac{{ – 3}}{2}\ x = frac{{ – 3}}{2} + frac{4}{5}\ x = – frac{7}{{10}} end{array} )