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65=5(1+r)
We move all terms to the left:
65-(5(1+r))=0
We add all the numbers together, and all the variables
-(5(r+1))+65=0
We calculate terms in parentheses: -(5(r+1)), so:We get rid of parentheses
5(r+1)
We multiply parentheses
5r+5
Back to the equation:
-(5r+5)
-5r-5+65=0
We add all the numbers together, and all the variables
-5r+60=0
We move all terms containing r to the left, all other terms to the right
-5r=-60
r=-60/-5
r=+12
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