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(8r+6)=(9r-7)
We move all terms to the left:
(8r+6)-((9r-7))=0
We get rid of parentheses
8r-((9r-7))+6=0
We calculate terms in parentheses: -((9r-7)), so:We get rid of parentheses
(9r-7)
We get rid of parentheses
9r-7
Back to the equation:
-(9r-7)
8r-9r+7+6=0
We add all the numbers together, and all the variables
-1r+13=0
We move all terms containing r to the left, all other terms to the right
-r=-13
r=-13/-1
r=+13
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