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5r-4=3r+4
We move all terms to the left:
5r-4-(3r+4)=0
We get rid of parentheses
5r-3r-4-4=0
We add all the numbers together, and all the variables
2r-8=0
We move all terms containing r to the left, all other terms to the right
2r=8
r=8/2
r=4
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