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-83=-4(2r+5)-7
We move all terms to the left:
-83-(-4(2r+5)-7)=0
We calculate terms in parentheses: -(-4(2r+5)-7), so:We get rid of parentheses
-4(2r+5)-7
We multiply parentheses
-8r-20-7
We add all the numbers together, and all the variables
-8r-27
Back to the equation:
-(-8r-27)
8r+27-83=0
We add all the numbers together, and all the variables
8r-56=0
We move all terms containing r to the left, all other terms to the right
8r=56
r=56/8
r=7
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