15+6=7f

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Solution for 15+6=7f equation: 



15+6=7f

We move all terms to the left:

15+6-(7f)=0

We add all the numbers together, and all the variables

-7f+21=0

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

-7f=-21

f=-21/-7

f=+3

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