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6=6(r+3)
We move all terms to the left:
6-(6(r+3))=0
We calculate terms in parentheses: -(6(r+3)), so:We get rid of parentheses
6(r+3)
We multiply parentheses
6r+18
Back to the equation:
-(6r+18)
-6r-18+6=0
We add all the numbers together, and all the variables
-6r-12=0
We move all terms containing r to the left, all other terms to the right
-6r=12
r=12/-6
r=-2
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