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25+2.50r=57.50
We move all terms to the left:
25+2.50r-(57.50)=0
We add all the numbers together, and all the variables
2.50r+25-(57.5)=0
We add all the numbers together, and all the variables
2.50r-32.5=0
We move all terms containing r to the left, all other terms to the right
2.50r=32.5
r=32.5/2.50
r=13
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