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45=5(r+10)
We move all terms to the left:
45-(5(r+10))=0
We calculate terms in parentheses: -(5(r+10)), so:We get rid of parentheses
5(r+10)
We multiply parentheses
5r+50
Back to the equation:
-(5r+50)
-5r-50+45=0
We add all the numbers together, and all the variables
-5r-5=0
We move all terms containing r to the left, all other terms to the right
-5r=5
r=5/-5
r=-1
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