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121.80=63.80+63.80r
We move all terms to the left:
121.80-(63.80+63.80r)=0
We add all the numbers together, and all the variables
-(63.80r+63.8)+121.80=0
We add all the numbers together, and all the variables
-(63.80r+63.8)+121.8=0
We get rid of parentheses
-63.80r-63.8+121.8=0
We add all the numbers together, and all the variables
-63.8r+58=0
We move all terms containing r to the left, all other terms to the right
-63.8r=-58
r=-58/-63.8
r=58/63.8
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