20/y-20/y-4=5/y

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Solution for 20/y-20/y-4=5/y equation: 


D( y )

y = 0

y = 0

y = 0

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

20/y-(20/y)-4 = 5/y // - 5/y

20/y-(20/y)-(5/y)-4 = 0

20/y-20*y^-1-5*y^-1-4 = 0

-5*y^-1 = 4 // : -5

y^-1 = -4/5

-1 < 0

1/(y^1) = -4/5 // * y^1

1 = -4/5*y^1 // : -4/5

-5/4 = y^1

y = -5/4

y = -5/4

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