9=f-3

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Solution for 9=f-3 equation: 



9=f-3

We move all terms to the left:

9-(f-3)=0

We get rid of parentheses

-f+3+9=0

We add all the numbers together, and all the variables

-1f+12=0

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

-f=-12

f=-12/-1

f=+12

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