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-3.75=-2.50r
We move all terms to the left:
-3.75-(-2.50r)=0
We add all the numbers together, and all the variables
-(-2.5r)-3.75=0
We get rid of parentheses
2.5r-3.75=0
We move all terms containing r to the left, all other terms to the right
2.5r=3.75
r=3.75/2.5
r=1+1/2
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