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9r=4r+50
We move all terms to the left:
9r-(4r+50)=0
We get rid of parentheses
9r-4r-50=0
We add all the numbers together, and all the variables
5r-50=0
We move all terms containing r to the left, all other terms to the right
5r=50
r=50/5
r=10
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