Question
$$\frac{1}{12}r+2 = 1$$
Answer
$$ r = -12 $$
Explanation
$$ \begin{aligned} \frac{1}{12}r+2 &= 1&& \text{multiply ALL terms by } \color{blue}{ 12 }. \\[1 em]12 \cdot \frac{1}{12}r+12\cdot2 &= 12\cdot1&& \text{cancel out the denominators} \\[1 em]r+24 &= 12&& \text{ move 24 to the right } \\[1 em]r &= 12-24&& \\[1 em]r &= -12&& \\[1 em]r &= -12&& \\[1 em] \end{aligned} $$
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