$$c+5 = 26-2c$$
Answer
$$ c = 7 $$
Explanation
$$ \begin{aligned} c+5 &= 26-2c&& \text{move the $ \color{blue}{ -2c } $ to the left side and $ \color{blue}{ 5 }$ to the right} \\[1 em]c+2c &= 26-5&& \text{simplify left and right hand side} \\[1 em]3c &= 21&& \text{ divide both sides by $ 3 $ } \\[1 em]c &= \frac{21}{3}&& \\[1 em]c &= 7&& \\[1 em] \end{aligned} $$
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