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25=5(r+3)
We move all terms to the left:
25-(5(r+3))=0
We calculate terms in parentheses: -(5(r+3)), so:We get rid of parentheses
5(r+3)
We multiply parentheses
5r+15
Back to the equation:
-(5r+15)
-5r-15+25=0
We add all the numbers together, and all the variables
-5r+10=0
We move all terms containing r to the left, all other terms to the right
-5r=-10
r=-10/-5
r=+2
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