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-36=3f+12
We move all terms to the left:
-36-(3f+12)=0
We get rid of parentheses
-3f-12-36=0
We add all the numbers together, and all the variables
-3f-48=0
We move all terms containing f to the left, all other terms to the right
-3f=48
f=48/-3
f=-16
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