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55=48+63r
We move all terms to the left:
55-(48+63r)=0
We add all the numbers together, and all the variables
-(63r+48)+55=0
We get rid of parentheses
-63r-48+55=0
We add all the numbers together, and all the variables
-63r+7=0
We move all terms containing r to the left, all other terms to the right
-63r=-7
r=-7/-63
r=1/9
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