2=20/y-4

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Solution for 2=20/y-4 equation: 


D( y )

y = 0

y = 0

y = 0

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

2 = 20/y-4 // - 20/y-4

2-(20/y)+4 = 0

2-20*y^-1+4 = 0

-20*y^-1 = -6 // : -20

y^-1 = 3/10

-1 < 0

1/(y^1) = 3/10 // * y^1

1 = 3/10*y^1 // : 3/10

10/3 = y^1

y = 10/3

y = 10/3

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