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14=2(r-9)
We move all terms to the left:
14-(2(r-9))=0
We calculate terms in parentheses: -(2(r-9)), so:We get rid of parentheses
2(r-9)
We multiply parentheses
2r-18
Back to the equation:
-(2r-18)
-2r+18+14=0
We add all the numbers together, and all the variables
-2r+32=0
We move all terms containing r to the left, all other terms to the right
-2r=-32
r=-32/-2
r=+16
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