$$4+x = 3x-8+2x$$

$$ \begin{aligned} 4+x &= 3x-8+2x&& \text{simplify left and right hand side} \\[1 em]x+4 &= 5x-8&& \text{move the $ \color{blue}{ 5x } $ to the left side and $ \color{blue}{ 4 }$ to the right} \\[1 em]x-5x &= -8-4&& \text{simplify left and right hand side} \\[1 em]-4x &= -12&& \text{ divide both sides by $ -4 $ } \\[1 em]x &= \frac{-12}{-4}&& \\[1 em]x &= 3&& \\[1 em] \end{aligned} $$

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