Đáp án:
$\begin{array}{l}
\dfrac{{4x - 1,5}}{{0,5}} - \dfrac{{5x - 0,8}}{{0,2}} = \dfrac{{1,2 - x}}{{0,1}}\\
\Rightarrow \dfrac{{4x}}{{0,5}} - \dfrac{{1,5}}{{0,5}} - \dfrac{{5x}}{{0,2}} + \dfrac{{0,8}}{{0,2}} = \dfrac{{1,2}}{{0,1}} - \dfrac{x}{{0,1}}\\
\Rightarrow 8x - 3 - 25x + 4 = 12 - 10x\\
\Rightarrow 25x - 8x - 10x = - 3 + 4 - 12\\
\Rightarrow 7x = - 11\\
\Rightarrow x = \dfrac{{ - 11}}{7}\\
Vay\,x = - \dfrac{{11}}{7}
\end{array}$
