Question
$$-9 = 3+3x$$
Answer
$$ x = -4 $$
Explanation
$$ \begin{aligned} -9 &= 3+3x&& \text{ swap the left and right side of the equation } \\[1 em]3+3x &= -9&& \text{ move 3 to the right } \\[1 em]3x &= -9-3&& \\[1 em]3x &= -12&& \text{ divide both sides by $ 3 $ } \\[1 em]x &= -\frac{12}{3}&& \\[1 em]x &= -4&& \\[1 em] \end{aligned} $$
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