13-4f=-7

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Solution for 13-4f=-7 equation: 



13-4f=-7

We move all terms to the left:

13-4f-(-7)=0

We add all the numbers together, and all the variables

-4f+20=0

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

-4f=-20

f=-20/-4

f=+5

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