Tìm x biết \((8,8x - 50):0,4 = 51\)

* Hướng dẫn giải

 \(\begin{aligned} &(8,8x - 50):0,4 = 51\\ &\left( {\frac{{44}}{5}x - 50} \right):\frac{2}{5} = 51\\ &\left( {\frac{{44}}{5}x - 50} \right).\frac{5}{2} = 51\\ &\frac{{44}}{5}x.\frac{5}{2} - 50.\frac{5}{2} = 51\\ &22x - 125 = 51\\ &22x = 51 + 125\\ &22x = 176\\ &x = 176:22\\ &x = 8 \end{aligned}\)