$$42-5(2x-9) = 27$$
Answer
$$ x = 6 $$
Explanation
$$ \begin{aligned} 42-5(2x-9) &= 27&& \text{simplify left side} \\[1 em]42-(10x-45) &= 27&& \\[1 em]42-10x+45 &= 27&& \\[1 em]-10x+87 &= 27&& \text{ move 87 to the right } \\[1 em]-10x &= 27-87&& \\[1 em]-10x &= -60&& \text{ divide both sides by $ -10 $ } \\[1 em]x &= \frac{-60}{-10}&& \\[1 em]x &= 6&& \\[1 em] \end{aligned} $$
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