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f/13=-10
We move all terms to the left:
f/13-(-10)=0
We add all the numbers together, and all the variables
f/13+10=0
We multiply all the terms by the denominator
f+10*13=0
We add all the numbers together, and all the variables
f+130=0
We move all terms containing f to the left, all other terms to the right
f=-130
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