$$ \begin{aligned} 144 &= -12(x-5)&& \text{simplify right side} \\[1 em]144 &= -(12x-60)&& \\[1 em]144 &= -12x+60&& \text{ swap the left and right side of the equation } \\[1 em]-12x+60 &= 144&& \text{ move 60 to the right } \\[1 em]-12x &= 144-60&& \\[1 em]-12x &= 84&& \text{ divide both sides by $ -12 $ } \\[1 em]x &= -\frac{84}{12}&& \\[1 em]x &= -7&& \\[1 em] \end{aligned} $$

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