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8r=10+7r
We move all terms to the left:
8r-(10+7r)=0
We add all the numbers together, and all the variables
8r-(7r+10)=0
We get rid of parentheses
8r-7r-10=0
We add all the numbers together, and all the variables
r-10=0
We move all terms containing r to the left, all other terms to the right
r=10
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