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f/2+9=6
We move all terms to the left:
f/2+9-(6)=0
We add all the numbers together, and all the variables
f/2+3=0
We multiply all the terms by the denominator
f+3*2=0
We add all the numbers together, and all the variables
f+6=0
We move all terms containing f to the left, all other terms to the right
f=-6
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