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12f+9=7f+14
We move all terms to the left:
12f+9-(7f+14)=0
We get rid of parentheses
12f-7f-14+9=0
We add all the numbers together, and all the variables
5f-5=0
We move all terms containing f to the left, all other terms to the right
5f=5
f=5/5
f=1
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