-f=2f+18

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Solution for -f=2f+18 equation: 



-f=2f+18

We move all terms to the left:

-f-(2f+18)=0

We add all the numbers together, and all the variables

-1f-(2f+18)=0

We get rid of parentheses

-1f-2f-18=0

We add all the numbers together, and all the variables

-3f-18=0

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

-3f=18

f=18/-3

f=-6

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