Question
$$9x+36 = 90\cdot0$$
Answer
$$ x = -4 $$
Explanation
$$ \begin{aligned} 9x+36 &= 90\cdot0&& \text{move the $ \color{blue}{ 0 } $ to the left side and $ \color{blue}{ 36 }$ to the right} \\[1 em]9x+0 &= -36&& \text{ divide both sides by $ 9 $ } \\[1 em]x &= -\frac{36}{9}&& \\[1 em]x &= -4&& \\[1 em] \end{aligned} $$
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