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