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f/10+18=13
We move all terms to the left:
f/10+18-(13)=0
We add all the numbers together, and all the variables
f/10+5=0
We multiply all the terms by the denominator
f+5*10=0
We add all the numbers together, and all the variables
f+50=0
We move all terms containing f to the left, all other terms to the right
f=-50
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