Tìm x biết :|-2/3.x+3/8|.(-8/5)=-8/15

* Hướng dẫn giải

$\left|\left(-\frac{2}{3}\right)x+\frac{3}{8}\right|.\left(-\frac{8}{5}\right)=-\frac{8}{15}\iff \left|-\frac{2}{3}x+\frac{3}{8}\right|=\frac{1}{3}\iff \left[\begin{array}{l}-\frac{2}{3}x+\frac{3}{8}=-\frac{1}{3}\\ -\frac{2}{3}x+\frac{3}{8}=\frac{1}{3}\end{array}\right.\iff \left[\begin{array}{l}x=\frac{17}{16}\\ x=\frac{1}{16}\end{array}\right.$