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f/7+66=70
We move all terms to the left:
f/7+66-(70)=0
We add all the numbers together, and all the variables
f/7-4=0
We multiply all the terms by the denominator
f-4*7=0
We add all the numbers together, and all the variables
f-28=0
We move all terms containing f to the left, all other terms to the right
f=28
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