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-4(r-18)=12
We move all terms to the left:
-4(r-18)-(12)=0
We multiply parentheses
-4r+72-12=0
We add all the numbers together, and all the variables
-4r+60=0
We move all terms containing r to the left, all other terms to the right
-4r=-60
r=-60/-4
r=+15
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