Question
$$2x+8x = 2(x+4)$$
Answer
$$ x = 1 $$
Explanation
$$ \begin{aligned} 2x+8x &= 2(x+4)&& \text{simplify left and right hand side} \\[1 em]10x &= 2x+8&& \text{move the $ \color{blue}{ 2x } $ to the left side} \\[1 em]10x-2x &= 8&& \text{simplify left side} \\[1 em]8x &= 8&& \text{ divide both sides by $ 8 $ } \\[1 em]x &= \frac{8}{8}&& \\[1 em]x &= 1&& \\[1 em] \end{aligned} $$
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