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12=2(r+5)
We move all terms to the left:
12-(2(r+5))=0
We calculate terms in parentheses: -(2(r+5)), so:We get rid of parentheses
2(r+5)
We multiply parentheses
2r+10
Back to the equation:
-(2r+10)
-2r-10+12=0
We add all the numbers together, and all the variables
-2r+2=0
We move all terms containing r to the left, all other terms to the right
-2r=-2
r=-2/-2
r=1
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