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11=2.5r
We move all terms to the left:
11-(2.5r)=0
We add all the numbers together, and all the variables
-(+2.5r)+11=0
We get rid of parentheses
-2.5r+11=0
We move all terms containing r to the left, all other terms to the right
-2.5r=-11
r=-11/-2.5
r=4+1/2.5
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