Question
$$x\cdot2+4x-84 = 81$$
Answer
$$ x = \dfrac{55}{2} $$
Explanation
$$ \begin{aligned} x\cdot2+4x-84 &= 81&& \text{simplify left side} \\[1 em]x\cdot2+4x-84 &= 81&& \\[1 em]6x-84 &= 81&& \text{ move -84 to the right } \\[1 em]6x &= 81+84&& \\[1 em]6x &= 165&& \text{ divide both sides by $ 6 $ } \\[1 em]x &= \frac{165}{6}&& \\[1 em]x &= \frac{55}{2}&& \\[1 em] \end{aligned} $$
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