$$ \begin{aligned} 18 &= 4(c-13)+2&& \text{simplify right side} \\[1 em]18 &= 4c-52+2&& \\[1 em]18 &= 4c-50&& \text{ swap the left and right side of the equation } \\[1 em]4c-50 &= 18&& \text{ move -50 to the right } \\[1 em]4c &= 18+50&& \\[1 em]4c &= 68&& \text{ divide both sides by $ 4 $ } \\[1 em]c &= \frac{68}{4}&& \\[1 em]c &= 17&& \\[1 em] \end{aligned} $$

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