15=f+9

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Solution for 15=f+9 equation: 



15=f+9

We move all terms to the left:

15-(f+9)=0

We get rid of parentheses

-f-9+15=0

We add all the numbers together, and all the variables

-1f+6=0

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

-f=-6

f=-6/-1

f=+6

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