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3(4r+2)=
We move all terms to the left:
3(4r+2)-()=0
We add all the numbers together, and all the variables
3(4r+2)=0
We multiply parentheses
12r+6=0
We move all terms containing r to the left, all other terms to the right
12r=-6
r=-6/12
r=-1/2
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