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4r+10=2r+40
We move all terms to the left:
4r+10-(2r+40)=0
We get rid of parentheses
4r-2r-40+10=0
We add all the numbers together, and all the variables
2r-30=0
We move all terms containing r to the left, all other terms to the right
2r=30
r=30/2
r=15
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