$$ \begin{aligned} 6-2x+2+5x &= 12+x+4&& \text{simplify left and right hand side} \\[1 em]3x+8 &= x+16&& \text{move the $ \color{blue}{ x } $ to the left side and $ \color{blue}{ 8 }$ to the right} \\[1 em]3x-x &= 16-8&& \text{simplify left and right hand side} \\[1 em]2x &= 8&& \text{ divide both sides by $ 2 $ } \\[1 em]x &= \frac{8}{2}&& \\[1 em]x &= 4&& \\[1 em] \end{aligned} $$

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