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4-7f=7f-12
We move all terms to the left:
4-7f-(7f-12)=0
We get rid of parentheses
-7f-7f+12+4=0
We add all the numbers together, and all the variables
-14f+16=0
We move all terms containing f to the left, all other terms to the right
-14f=-16
f=-16/-14
f=1+1/7
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