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83=-7(4r-2)+5r
We move all terms to the left:
83-(-7(4r-2)+5r)=0
We calculate terms in parentheses: -(-7(4r-2)+5r), so:We get rid of parentheses
-7(4r-2)+5r
We add all the numbers together, and all the variables
5r-7(4r-2)
We multiply parentheses
5r-28r+14
We add all the numbers together, and all the variables
-23r+14
Back to the equation:
-(-23r+14)
23r-14+83=0
We add all the numbers together, and all the variables
23r+69=0
We move all terms containing r to the left, all other terms to the right
23r=-69
r=-69/23
r=-3
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