Question
$$81 = 5+10w+9w$$
Answer
$$ w = 4 $$
Explanation
$$ \begin{aligned} 81 &= 5+10w+9w&& \text{simplify right side} \\[1 em]81 &= 19w+5&& \text{ swap the left and right side of the equation } \\[1 em]19w+5 &= 81&& \text{ move 5 to the right } \\[1 em]19w &= 81-5&& \\[1 em]19w &= 76&& \text{ divide both sides by $ 19 $ } \\[1 em]w &= \frac{76}{19}&& \\[1 em]w &= 4&& \\[1 em] \end{aligned} $$
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