7=9-f

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Solution for 7=9-f equation: 



7=9-f

We move all terms to the left:

7-(9-f)=0

We add all the numbers together, and all the variables

-(-1f+9)+7=0

We get rid of parentheses

1f-9+7=0

We add all the numbers together, and all the variables

f-2=0

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

f=2

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