-f+9=-9+8f

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Solution for -f+9=-9+8f equation: 



-f+9=-9+8f

We move all terms to the left:

-f+9-(-9+8f)=0

We add all the numbers together, and all the variables

-f-(8f-9)+9=0

We add all the numbers together, and all the variables

-1f-(8f-9)+9=0

We get rid of parentheses

-1f-8f+9+9=0

We add all the numbers together, and all the variables

-9f+18=0

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

-9f=-18

f=-18/-9

f=+2

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