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-12=4f+8
We move all terms to the left:
-12-(4f+8)=0
We get rid of parentheses
-4f-8-12=0
We add all the numbers together, and all the variables
-4f-20=0
We move all terms containing f to the left, all other terms to the right
-4f=20
f=20/-4
f=-5
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