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-9(-4-2r)=6(2r+11)
We move all terms to the left:
-9(-4-2r)-(6(2r+11))=0
We add all the numbers together, and all the variables
-9(-2r-4)-(6(2r+11))=0
We multiply parentheses
18r-(6(2r+11))+36=0
We calculate terms in parentheses: -(6(2r+11)), so:We get rid of parentheses
6(2r+11)
We multiply parentheses
12r+66
Back to the equation:
-(12r+66)
18r-12r-66+36=0
We add all the numbers together, and all the variables
6r-30=0
We move all terms containing r to the left, all other terms to the right
6r=30
r=30/6
r=5
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