Question
$$148+x = 20+9x$$
Answer
$$ x = 16 $$
Explanation
$$ \begin{aligned} 148+x &= 20+9x&& \text{move the $ \color{blue}{ 9x } $ to the left side and $ \color{blue}{ 148 }$ to the right} \\[1 em]x-9x &= 20-148&& \text{simplify left and right hand side} \\[1 em]-8x &= -128&& \text{ divide both sides by $ -8 $ } \\[1 em]x &= \frac{-128}{-8}&& \\[1 em]x &= 16&& \\[1 em] \end{aligned} $$
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