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-53=-4r+7
We move all terms to the left:
-53-(-4r+7)=0
We get rid of parentheses
4r-7-53=0
We add all the numbers together, and all the variables
4r-60=0
We move all terms containing r to the left, all other terms to the right
4r=60
r=60/4
r=15
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