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(3r+7)2-34=
We move all terms to the left:
(3r+7)2-34-()=0
We add all the numbers together, and all the variables
(3r+7)2=0
We multiply parentheses
6r+14=0
We move all terms containing r to the left, all other terms to the right
6r=-14
r=-14/6
r=-2+1/3
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