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(8.r)=56
We move all terms to the left:
(8.r)-(56)=0
We add all the numbers together, and all the variables
(+8.r)-56=0
We get rid of parentheses
8.r-56=0
We move all terms containing r to the left, all other terms to the right
8.r=56
r=56/8.
r=7
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