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8r-11=-5(1r-3)
We move all terms to the left:
8r-11-(-5(1r-3))=0
We add all the numbers together, and all the variables
8r-(-5(r-3))-11=0
We calculate terms in parentheses: -(-5(r-3)), so:We get rid of parentheses
-5(r-3)
We multiply parentheses
-5r+15
Back to the equation:
-(-5r+15)
8r+5r-15-11=0
We add all the numbers together, and all the variables
13r-26=0
We move all terms containing r to the left, all other terms to the right
13r=26
r=26/13
r=2
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