Question
$$2\cdot2x+4(4x+2) = 108$$
Answer
$$ x = 5 $$
Explanation
$$ \begin{aligned} 2\cdot2x+4(4x+2) &= 108&& \text{simplify left side} \\[1 em]4x+16x+8 &= 108&& \\[1 em]20x+8 &= 108&& \text{ move 8 to the right } \\[1 em]20x &= 108-8&& \\[1 em]20x &= 100&& \text{ divide both sides by $ 20 $ } \\[1 em]x &= \frac{100}{20}&& \\[1 em]x &= 5&& \\[1 em] \end{aligned} $$
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