Question
$$20 = 4(x+3)$$
Answer
$$ x = 2 $$
Explanation
$$ \begin{aligned} 20 &= 4(x+3)&& \text{simplify right side} \\[1 em]20 &= 4x+12&& \text{ swap the left and right side of the equation } \\[1 em]4x+12 &= 20&& \text{ move 12 to the right } \\[1 em]4x &= 20-12&& \\[1 em]4x &= 8&& \text{ divide both sides by $ 4 $ } \\[1 em]x &= \frac{8}{4}&& \\[1 em]x &= 2&& \\[1 em] \end{aligned} $$
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