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-11-15=10r-18r+18
We move all terms to the left:
-11-15-(10r-18r+18)=0
We add all the numbers together, and all the variables
-(-8r+18)-11-15=0
We add all the numbers together, and all the variables
-(-8r+18)-26=0
We get rid of parentheses
8r-18-26=0
We add all the numbers together, and all the variables
8r-44=0
We move all terms containing r to the left, all other terms to the right
8r=44
r=44/8
r=5+1/2
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