-f+20=4f

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Solution for -f+20=4f equation: 



-f+20=4f

We move all terms to the left:

-f+20-(4f)=0

We add all the numbers together, and all the variables

-5f+20=0

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

-5f=-20

f=-20/-5

f=+4

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