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-5=-3f+7
We move all terms to the left:
-5-(-3f+7)=0
We get rid of parentheses
3f-7-5=0
We add all the numbers together, and all the variables
3f-12=0
We move all terms containing f to the left, all other terms to the right
3f=12
f=12/3
f=4
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