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12-14f=12f+6
We move all terms to the left:
12-14f-(12f+6)=0
We get rid of parentheses
-14f-12f-6+12=0
We add all the numbers together, and all the variables
-26f+6=0
We move all terms containing f to the left, all other terms to the right
-26f=-6
f=-6/-26
f=3/13
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