-f+9=-2f

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Solution for -f+9=-2f equation: 



-f+9=-2f

We move all terms to the left:

-f+9-(-2f)=0

We add all the numbers together, and all the variables

-1f-(-2f)+9=0

We get rid of parentheses

-1f+2f+9=0

We add all the numbers together, and all the variables

f+9=0

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

f=-9

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