$$ \begin{aligned} 3(p-4) &= 6p&& \text{simplify left side} \\[1 em]3p-12 &= 6p&& \text{move the $ \color{blue}{ 6p } $ to the left side and $ \color{blue}{ -12 }$ to the right} \\[1 em]3p-6p &= 12&& \text{simplify left side} \\[1 em]-3p &= 12&& \text{ divide both sides by $ -3 $ } \\[1 em]p &= -\frac{12}{3}&& \\[1 em]p &= -4&& \\[1 em] \end{aligned} $$

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