Question
$$x+18 = 4x+27$$
Answer
$$ x = -3 $$
Explanation
$$ \begin{aligned} x+18 &= 4x+27&& \text{move the $ \color{blue}{ 4x } $ to the left side and $ \color{blue}{ 18 }$ to the right} \\[1 em]x-4x &= 27-18&& \text{simplify left and right hand side} \\[1 em]-3x &= 9&& \text{ divide both sides by $ -3 $ } \\[1 em]x &= -\frac{9}{3}&& \\[1 em]x &= -3&& \\[1 em] \end{aligned} $$
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