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-1=r-98+-1
We move all terms to the left:
-1-(r-98+-1)=0
We add all the numbers together, and all the variables
-(r-99)-1=0
We get rid of parentheses
-r+99-1=0
We add all the numbers together, and all the variables
-1r+98=0
We move all terms containing r to the left, all other terms to the right
-r=-98
r=-98/-1
r=+98
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