8/f=20

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Solution for 8/f=20 equation: 


D( f )

f = 0

f = 0

f = 0

f in (-oo:0) U (0:+oo)

8/f = 20 // - 20

8/f-20 = 0

8*f^-1 = 20 // : 8

f^-1 = 5/2

-1 < 0

1/(f^1) = 5/2 // * f^1

1 = 5/2*f^1 // : 5/2

2/5 = f^1

f = 2/5

f = 2/5

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