Question
Solve: $\frac{\mathrm{x}}{2}+\mathrm{x}=9$
✓
Answer
$\begin{aligned} & \frac{x}{2}+x=9 \\ & \frac{x}{2}+\frac{x}{1}=9 \\ & \frac{x+2 x}{2}=9 \\ & \Rightarrow x+2 x=2 \times 9 \\ & \Rightarrow 3 x=18 \\ & \Rightarrow x=\frac{18}{3}=6 \\ & \therefore x=6\end{aligned}$
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