$$ \begin{aligned} 48+x+40 &= 3x+24&& \text{simplify left side} \\[1 em]x+88 &= 3x+24&& \text{move the $ \color{blue}{ 3x } $ to the left side and $ \color{blue}{ 88 }$ to the right} \\[1 em]x-3x &= 24-88&& \text{simplify left and right hand side} \\[1 em]-2x &= -64&& \text{ divide both sides by $ -2 $ } \\[1 em]x &= \frac{-64}{-2}&& \\[1 em]x &= 32&& \\[1 em] \end{aligned} $$

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