f+15=2f

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Solution for f+15=2f equation: 



f+15=2f

We move all terms to the left:

f+15-(2f)=0

We add all the numbers together, and all the variables

-1f+15=0

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

-f=-15

f=-15/-1

f=+15

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