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2r+3=135-20r
We move all terms to the left:
2r+3-(135-20r)=0
We add all the numbers together, and all the variables
2r-(-20r+135)+3=0
We get rid of parentheses
2r+20r-135+3=0
We add all the numbers together, and all the variables
22r-132=0
We move all terms containing r to the left, all other terms to the right
22r=132
r=132/22
r=6
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