Question
$$11 = 6r+5r$$
Answer
$$ r = 1 $$
Explanation
$$ \begin{aligned} 11 &= 6r+5r&& \text{simplify right side} \\[1 em]11 &= 11r&& \text{ swap the left and right side of the equation } \\[1 em]11r &= 11&& \text{ divide both sides by $ 11 $ } \\[1 em]r &= \frac{11}{11}&& \\[1 em]r &= 1&& \\[1 em] \end{aligned} $$
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