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53=-7-4r
We move all terms to the left:
53-(-7-4r)=0
We add all the numbers together, and all the variables
-(-4r-7)+53=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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