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39=15-(3f)
We move all terms to the left:
39-(15-(3f))=0
We add all the numbers together, and all the variables
-(-3f+15)+39=0
We get rid of parentheses
3f-15+39=0
We add all the numbers together, and all the variables
3f+24=0
We move all terms containing f to the left, all other terms to the right
3f=-24
f=-24/3
f=-8
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