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f+6=5f+12
We move all terms to the left:
f+6-(5f+12)=0
We get rid of parentheses
f-5f-12+6=0
We add all the numbers together, and all the variables
-4f-6=0
We move all terms containing f to the left, all other terms to the right
-4f=6
f=6/-4
f=-1+1/2
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