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f/13+8=11
We move all terms to the left:
f/13+8-(11)=0
We add all the numbers together, and all the variables
f/13-3=0
We multiply all the terms by the denominator
f-3*13=0
We add all the numbers together, and all the variables
f-39=0
We move all terms containing f to the left, all other terms to the right
f=39
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