Question
$$-14 = 4-(r+8)$$
Answer
$$ r = 10 $$
Explanation
$$ \begin{aligned} -14 &= 4-(r+8)&& \text{simplify right side} \\[1 em]-14 &= 4-r-8&& \\[1 em]-14 &= -r-4&& \text{ swap the left and right side of the equation } \\[1 em]-r-4 &= -14&& \text{ move -4 to the right } \\[1 em]-r &= -14+4&& \\[1 em]-r &= -10&& \text{switch signs on both sides} \\[1 em]r &= 10&& \\[1 em] \end{aligned} $$
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