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f/3+15=18
We move all terms to the left:
f/3+15-(18)=0
We add all the numbers together, and all the variables
f/3-3=0
We multiply all the terms by the denominator
f-3*3=0
We add all the numbers together, and all the variables
f-9=0
We move all terms containing f to the left, all other terms to the right
f=9
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