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-20=5(6r+3)
We move all terms to the left:
-20-(5(6r+3))=0
We calculate terms in parentheses: -(5(6r+3)), so:We get rid of parentheses
5(6r+3)
We multiply parentheses
30r+15
Back to the equation:
-(30r+15)
-30r-15-20=0
We add all the numbers together, and all the variables
-30r-35=0
We move all terms containing r to the left, all other terms to the right
-30r=35
r=35/-30
r=-1+1/6
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