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9r+10=4r-10
We move all terms to the left:
9r+10-(4r-10)=0
We get rid of parentheses
9r-4r+10+10=0
We add all the numbers together, and all the variables
5r+20=0
We move all terms containing r to the left, all other terms to the right
5r=-20
r=-20/5
r=-4
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