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34=-2(r-97)
We move all terms to the left:
34-(-2(r-97))=0
We calculate terms in parentheses: -(-2(r-97)), so:We get rid of parentheses
-2(r-97)
We multiply parentheses
-2r+194
Back to the equation:
-(-2r+194)
2r-194+34=0
We add all the numbers together, and all the variables
2r-160=0
We move all terms containing r to the left, all other terms to the right
2r=160
r=160/2
r=80
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