Question
$$x = 90+4x+20+2x+28$$
Answer
$$ x = -\dfrac{138}{5} $$
Explanation
$$ \begin{aligned} x &= 90+4x+20+2x+28&& \text{simplify right side} \\[1 em]x &= 4x+110+2x+28&& \\[1 em]x &= 6x+138&& \text{move the $ \color{blue}{ 6x } $ to the left side} \\[1 em]x-6x &= 138&& \text{simplify left side} \\[1 em]-5x &= 138&& \text{ divide both sides by $ -5 $ } \\[1 em]x &= -\frac{138}{5}&& \\[1 em] \end{aligned} $$
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