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-11r-15=10r-18r+18
We move all terms to the left:
-11r-15-(10r-18r+18)=0
We add all the numbers together, and all the variables
-11r-(-8r+18)-15=0
We get rid of parentheses
-11r+8r-18-15=0
We add all the numbers together, and all the variables
-3r-33=0
We move all terms containing r to the left, all other terms to the right
-3r=33
r=33/-3
r=-11
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