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f/5-13=-6
We move all terms to the left:
f/5-13-(-6)=0
We add all the numbers together, and all the variables
f/5-7=0
We multiply all the terms by the denominator
f-7*5=0
We add all the numbers together, and all the variables
f-35=0
We move all terms containing f to the left, all other terms to the right
f=35
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