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-47=5(r-86)-87
We move all terms to the left:
-47-(5(r-86)-87)=0
We calculate terms in parentheses: -(5(r-86)-87), so:We get rid of parentheses
5(r-86)-87
We multiply parentheses
5r-430-87
We add all the numbers together, and all the variables
5r-517
Back to the equation:
-(5r-517)
-5r+517-47=0
We add all the numbers together, and all the variables
-5r+470=0
We move all terms containing r to the left, all other terms to the right
-5r=-470
r=-470/-5
r=+94
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