Question
$$50+x+3x+360-(110+x) = 360$$
Answer
$$ x = 20 $$
Explanation
$$ \begin{aligned} 50+x+3x+360-(110+x) &= 360&& \text{simplify left side} \\[1 em]4x+410-(110+x) &= 360&& \\[1 em]4x+410-110-x &= 360&& \\[1 em]3x+300 &= 360&& \text{ move 300 to the right } \\[1 em]3x &= 360-300&& \\[1 em]3x &= 60&& \text{ divide both sides by $ 3 $ } \\[1 em]x &= \frac{60}{3}&& \\[1 em]x &= 20&& \\[1 em] \end{aligned} $$
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