4=f-9

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Solution for 4=f-9 equation: 



4=f-9

We move all terms to the left:

4-(f-9)=0

We get rid of parentheses

-f+9+4=0

We add all the numbers together, and all the variables

-1f+13=0

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

-f=-13

f=-13/-1

f=+13

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