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5f+12f=3f+18
We move all terms to the left:
5f+12f-(3f+18)=0
We add all the numbers together, and all the variables
17f-(3f+18)=0
We get rid of parentheses
17f-3f-18=0
We add all the numbers together, and all the variables
14f-18=0
We move all terms containing f to the left, all other terms to the right
14f=18
f=18/14
f=1+2/7
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