4=20/y

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Solution for 4=20/y equation: 


D( y )

y = 0

y = 0

y = 0

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

4 = 20/y // - 20/y

4-(20/y) = 0

4-20*y^-1 = 0

-20*y^-1 = -4 // : -20

y^-1 = 1/5

-1 < 0

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

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

5 = y^1

y = 5

y = 5

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