Question
$$7+16x = 142+x$$
Answer
$$ x = 9 $$
Explanation
$$ \begin{aligned} 7+16x &= 142+x&& \text{move the $ \color{blue}{ x } $ to the left side and $ \color{blue}{ 7 }$ to the right} \\[1 em]16x-x &= 142-7&& \text{simplify left and right hand side} \\[1 em]15x &= 135&& \text{ divide both sides by $ 15 $ } \\[1 em]x &= \frac{135}{15}&& \\[1 em]x &= 9&& \\[1 em] \end{aligned} $$
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