Question
$$80 = x+x$$
Answer
$$ x = 40 $$
Explanation
$$ \begin{aligned} 80 &= x+x&& \text{simplify right side} \\[1 em]80 &= 2x&& \text{ swap the left and right side of the equation } \\[1 em]2x &= 80&& \text{ divide both sides by $ 2 $ } \\[1 em]x &= \frac{80}{2}&& \\[1 em]x &= 40&& \\[1 em] \end{aligned} $$
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