Question
$$-9(x+10)+3x = 0$$
Answer
$$ x = -15 $$
Explanation
$$ \begin{aligned} -9(x+10)+3x &= 0&& \text{simplify left side} \\[1 em]-(9x+90)+3x &= 0&& \\[1 em]-9x-90+3x &= 0&& \\[1 em]-6x-90 &= 0&& \text{ move the constants to the right } \\[1 em]-6x &= 90&& \text{ divide both sides by $ -6 $ } \\[1 em]x &= -\frac{90}{6}&& \\[1 em]x &= -15&& \\[1 em] \end{aligned} $$
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