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-r/36=-2
We move all terms to the left:
-r/36-(-2)=0
We add all the numbers together, and all the variables
-r/36+2=0
We multiply all the terms by the denominator
-r+2*36=0
We add all the numbers together, and all the variables
-1r+72=0
We move all terms containing r to the left, all other terms to the right
-r=-72
r=-72/-1
r=+72
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