Question
$$3 = -c\cdot2+5c\cdot2$$
Answer
$$ c = \dfrac{3}{8} $$
Explanation
$$ \begin{aligned} 3 &= -c\cdot2+5c\cdot2&& \text{simplify right side} \\[1 em]3 &= -2c+10c&& \\[1 em]3 &= 8c&& \text{ swap the left and right side of the equation } \\[1 em]8c &= 3&& \text{ divide both sides by $ 8 $ } \\[1 em]c &= \frac{3}{8}&& \\[1 em] \end{aligned} $$
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