Question
$$5x-9(x+2) = 0$$
Answer
$$ x = -\dfrac{9}{2} $$
Explanation
$$ \begin{aligned} 5x-9(x+2) &= 0&& \text{simplify left side} \\[1 em]5x-(9x+18) &= 0&& \\[1 em]5x-9x-18 &= 0&& \\[1 em]-4x-18 &= 0&& \text{ move the constants to the right } \\[1 em]-4x &= 18&& \text{ divide both sides by $ -4 $ } \\[1 em]x &= -\frac{18}{4}&& \\[1 em]x &= -\frac{9}{2}&& \\[1 em] \end{aligned} $$
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