15=39-3f

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Solution for 15=39-3f equation: 



15=39-3f

We move all terms to the left:

15-(39-3f)=0

We add all the numbers together, and all the variables

-(-3f+39)+15=0

We get rid of parentheses

3f-39+15=0

We add all the numbers together, and all the variables

3f-24=0

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

3f=24

f=24/3

f=8

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