$$ \begin{aligned} 3p-5 &= 2p+4&& \text{move the $ \color{blue}{ 2p } $ to the left side and $ \color{blue}{ -5 }$ to the right} \\[1 em]3p-2p &= 4+5&& \text{simplify left and right hand side} \\[1 em]p &= 9&& \\[1 em]p &= 9&& \\[1 em] \end{aligned} $$