Tìm x biết ​(begin{array}{I} – x – frac{7}{2} = frac{4}{{11}} end{array} )

Ta có:

 (begin{array}{I} – x – frac{7}{2} = frac{4}{{11}}\ – x = frac{4}{{11}} + frac{7}{2}\ – x = frac{{85}}{{22}}\ x = – frac{{85}}{{22}} end{array} )