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45=5r/25
We move all terms to the left:
45-(5r/25)=0
We add all the numbers together, and all the variables
-(+5r/25)+45=0
We get rid of parentheses
-5r/25+45=0
We multiply all the terms by the denominator
-5r+45*25=0
We add all the numbers together, and all the variables
-5r+1125=0
We move all terms containing r to the left, all other terms to the right
-5r=-1125
r=-1125/-5
r=+225
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