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r/25=-13
We move all terms to the left:
r/25-(-13)=0
We add all the numbers together, and all the variables
r/25+13=0
We multiply all the terms by the denominator
r+13*25=0
We add all the numbers together, and all the variables
r+325=0
We move all terms containing r to the left, all other terms to the right
r=-325
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