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56=7(r+7)
We move all terms to the left:
56-(7(r+7))=0
We calculate terms in parentheses: -(7(r+7)), so:We get rid of parentheses
7(r+7)
We multiply parentheses
7r+49
Back to the equation:
-(7r+49)
-7r-49+56=0
We add all the numbers together, and all the variables
-7r+7=0
We move all terms containing r to the left, all other terms to the right
-7r=-7
r=-7/-7
r=1
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