$$ \begin{aligned} 3p+1-5 &= -16+6p&& \text{simplify left and right hand side} \\[1 em]3p-4 &= 6p-16&& \text{move the $ \color{blue}{ 6p } $ to the left side and $ \color{blue}{ -4 }$ to the right} \\[1 em]3p-6p &= -16+4&& \text{simplify left and right hand side} \\[1 em]-3p &= -12&& \text{ divide both sides by $ -3 $ } \\[1 em]p &= \frac{-12}{-3}&& \\[1 em]p &= 4&& \\[1 em] \end{aligned} $$

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