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2(r-3)=6=14
We move all terms to the left:
2(r-3)-(6)=0
We multiply parentheses
2r-6-6=0
We add all the numbers together, and all the variables
2r-12=0
We move all terms containing r to the left, all other terms to the right
2r=12
r=12/2
r=6
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