9=4-f

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Solution for 9=4-f equation: 



9=4-f

We move all terms to the left:

9-(4-f)=0

We add all the numbers together, and all the variables

-(-1f+4)+9=0

We get rid of parentheses

1f-4+9=0

We add all the numbers together, and all the variables

f+5=0

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

f=-5

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