$$4x = 2(x+8)$$
Answer
$$ x = 8 $$
Explanation
$$ \begin{aligned} 4x &= 2(x+8)&& \text{simplify right side} \\[1 em]4x &= 2x+16&& \text{move the $ \color{blue}{ 2x } $ to the left side} \\[1 em]4x-2x &= 16&& \text{simplify left side} \\[1 em]2x &= 16&& \text{ divide both sides by $ 2 $ } \\[1 em]x &= \frac{16}{2}&& \\[1 em]x &= 8&& \\[1 em] \end{aligned} $$
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