15=f+3

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Solution for 15=f+3 equation: 



15=f+3

We move all terms to the left:

15-(f+3)=0

We get rid of parentheses

-f-3+15=0

We add all the numbers together, and all the variables

-1f+12=0

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

-f=-12

f=-12/-1

f=+12

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