Đáp án: x=7
Giải thích các bước giải:
$\begin{array}{l}
14\frac{1}{2} - \frac{{2\left( {x + 3} \right)}}{5} = \frac{{3x}}{2} - \frac{{2\left( {x - 7} \right)}}{3}\\
\Rightarrow \frac{{28 + 1}}{2} - \frac{{2x + 6}}{5} = \frac{{3x}}{2} - \frac{{2x - 14}}{3}\\
\Rightarrow \frac{{29.15 - 6.\left( {2x + 6} \right)}}{{30}} = \frac{{3x.15 - 10\left( {2x - 14} \right)}}{{30}}\\
\Rightarrow 435 - 12x - 36 = 45x - 20x + 140\\
\Rightarrow 25x + 12x = 435 - 36 - 140\\
\Rightarrow x = 7
\end{array}$
Vậy x=7
