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(3r-35)+(-2r+90)=180
We move all terms to the left:
(3r-35)+(-2r+90)-(180)=0
We get rid of parentheses
3r-2r-35+90-180=0
We add all the numbers together, and all the variables
r-125=0
We move all terms containing r to the left, all other terms to the right
r=125
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