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