$$ \begin{aligned} -13+1 &= -3(x+8)&& \text{simplify left and right hand side} \\[1 em]-12 &= -(3x+24)&& \\[1 em]-12 &= -3x-24&& \text{ swap the left and right side of the equation } \\[1 em]-3x-24 &= -12&& \text{ move -24 to the right } \\[1 em]-3x &= -12+24&& \\[1 em]-3x &= 12&& \text{ divide both sides by $ -3 $ } \\[1 em]x &= -\frac{12}{3}&& \\[1 em]x &= -4&& \\[1 em] \end{aligned} $$

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