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-3.75=2.5r
We move all terms to the left:
-3.75-(2.5r)=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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