18+f=3f

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Solution for 18+f=3f equation: 



18+f=3f

We move all terms to the left:

18+f-(3f)=0

We add all the numbers together, and all the variables

-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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