$$ \begin{aligned} 3\cdot(6-x) &= 2x&& \text{simplify left side} \\[1 em]18-3x &= 2x&& \\[1 em]-3x+18 &= 2x&& \text{move the $ \color{blue}{ 2x } $ to the left side and $ \color{blue}{ 18 }$ to the right} \\[1 em]-3x-2x &= -18&& \text{simplify left side} \\[1 em]-5x &= -18&& \text{ divide both sides by $ -5 $ } \\[1 em]x &= \frac{-18}{-5}&& \\[1 em]x &= \frac{18}{5}&& \\[1 em] \end{aligned} $$

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