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f/2+9=2
We move all terms to the left:
f/2+9-(2)=0
We add all the numbers together, and all the variables
f/2+7=0
We multiply all the terms by the denominator
f+7*2=0
We add all the numbers together, and all the variables
f+14=0
We move all terms containing f to the left, all other terms to the right
f=-14
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