$$ \begin{aligned} 2c+12 &= 5c&& \text{move the $ \color{blue}{ 5c } $ to the left side and $ \color{blue}{ 12 }$ to the right} \\[1 em]2c-5c &= -12&& \text{simplify left side} \\[1 em]-3c &= -12&& \text{ divide both sides by $ -3 $ } \\[1 em]c &= \frac{-12}{-3}&& \\[1 em]c &= 4&& \\[1 em] \end{aligned} $$
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