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-3(4r-12)=48
We move all terms to the left:
-3(4r-12)-(48)=0
We multiply parentheses
-12r+36-48=0
We add all the numbers together, and all the variables
-12r-12=0
We move all terms containing r to the left, all other terms to the right
-12r=12
r=12/-12
r=-1
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