$$ \begin{aligned} 9 &= -3(x+2)&& \text{simplify right side} \\[1 em]9 &= -(3x+6)&& \\[1 em]9 &= -3x-6&& \text{ swap the left and right side of the equation } \\[1 em]-3x-6 &= 9&& \text{ move -6 to the right } \\[1 em]-3x &= 9+6&& \\[1 em]-3x &= 15&& \text{ divide both sides by $ -3 $ } \\[1 em]x &= -\frac{15}{3}&& \\[1 em]x &= -5&& \\[1 em] \end{aligned} $$

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