6=f+9

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Solution for 6=f+9 equation: 



6=f+9

We move all terms to the left:

6-(f+9)=0

We get rid of parentheses

-f-9+6=0

We add all the numbers together, and all the variables

-1f-3=0

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

-f=3

f=3/-1

f=-3

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