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12=-7f+9
We move all terms to the left:
12-(-7f+9)=0
We get rid of parentheses
7f-9+12=0
We add all the numbers together, and all the variables
7f+3=0
We move all terms containing f to the left, all other terms to the right
7f=-3
f=-3/7
f=-3/7
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