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11=r-4-15
We move all terms to the left:
11-(r-4-15)=0
We add all the numbers together, and all the variables
-(r-19)+11=0
We get rid of parentheses
-r+19+11=0
We add all the numbers together, and all the variables
-1r+30=0
We move all terms containing r to the left, all other terms to the right
-r=-30
r=-30/-1
r=+30
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