9-f=-4f

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Solution for 9-f=-4f equation: 



9-f=-4f

We move all terms to the left:

9-f-(-4f)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

-1f+4f+9=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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