18=3f+9

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Solution for 18=3f+9 equation: 



18=3f+9

We move all terms to the left:

18-(3f+9)=0

We get rid of parentheses

-3f-9+18=0

We add all the numbers together, and all the variables

-3f+9=0

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

-3f=-9

f=-9/-3

f=+3

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