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2r+3=4r-3
We move all terms to the left:
2r+3-(4r-3)=0
We get rid of parentheses
2r-4r+3+3=0
We add all the numbers together, and all the variables
-2r+6=0
We move all terms containing r to the left, all other terms to the right
-2r=-6
r=-6/-2
r=+3
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