18=2f-4f

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Solution for 18=2f-4f equation: 



18=2f-4f

We move all terms to the left:

18-(2f-4f)=0

We add all the numbers together, and all the variables

-(-2f)+18=0

We get rid of parentheses

2f+18=0

We move all terms containing f to the left, all other terms to the right

2f=-18

f=-18/2

f=-9

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