-9-f=-f-9

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



-9-f=-f-9

We move all terms to the left:

-9-f-(-f-9)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

=0

f=0/1

f=0

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