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-2(f-12)=-12
We move all terms to the left:
-2(f-12)-(-12)=0
We add all the numbers together, and all the variables
-2(f-12)+12=0
We multiply parentheses
-2f+24+12=0
We add all the numbers together, and all the variables
-2f+36=0
We move all terms containing f to the left, all other terms to the right
-2f=-36
f=-36/-2
f=+18
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