$$ \begin{aligned} 5x-20+16x+16 &= 6x+6+5x+50&& \text{simplify left and right hand side} \\[1 em]21x-4 &= 11x+56&& \text{move the $ \color{blue}{ 11x } $ to the left side and $ \color{blue}{ -4 }$ to the right} \\[1 em]21x-11x &= 56+4&& \text{simplify left and right hand side} \\[1 em]10x &= 60&& \text{ divide both sides by $ 10 $ } \\[1 em]x &= \frac{60}{10}&& \\[1 em]x &= 6&& \\[1 em] \end{aligned} $$

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