b) -0,5 -1/3 (5x -1) = 1,5

* Hướng dẫn giải

b) $-0,5-\frac{1}{3}\left(5x-1\right)=1,5$

$\begin{array}{l}\frac{1}{3}.\left(5\mathrm{x}-1\right)=-0,5-1,5\\ \frac{1}{3}.\left(5\mathrm{x}-1\right)=-2\\ 5\mathrm{x}-1=(-2):\frac{1}{3}\end{array}$