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-7f+8=-3f-4
We move all terms to the left:
-7f+8-(-3f-4)=0
We get rid of parentheses
-7f+3f+4+8=0
We add all the numbers together, and all the variables
-4f+12=0
We move all terms containing f to the left, all other terms to the right
-4f=-12
f=-12/-4
f=+3
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