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5f+12=3f+1
We move all terms to the left:
5f+12-(3f+1)=0
We get rid of parentheses
5f-3f-1+12=0
We add all the numbers together, and all the variables
2f+11=0
We move all terms containing f to the left, all other terms to the right
2f=-11
f=-11/2
f=-5+1/2
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