17-f=-4

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Solution for 17-f=-4 equation: 



17-f=-4

We move all terms to the left:

17-f-(-4)=0

We add all the numbers together, and all the variables

-1f+21=0

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

-f=-21

f=-21/-1

f=+21

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