Question
$$3(-3x-1)+5x+4 = -15$$
Answer
$$ x = 4 $$
Explanation
$$ \begin{aligned} 3(-3x-1)+5x+4 &= -15&& \text{simplify left side} \\[1 em]-9x-3+5x+4 &= -15&& \\[1 em]-4x+1 &= -15&& \text{ move 1 to the right } \\[1 em]-4x &= -15-1&& \\[1 em]-4x &= -16&& \text{ divide both sides by $ -4 $ } \\[1 em]x &= \frac{-16}{-4}&& \\[1 em]x &= 4&& \\[1 em] \end{aligned} $$
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