8/20=4/y

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Solution for 8/20=4/y equation: 


D( y )

y = 0

y = 0

y = 0

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

8/20 = 4/y // - 4/y

8/20-(4/y) = 0

8/20-4*y^-1 = 0

-4*y^-1 = -2/5 // : -4

y^-1 = 1/10

-1 < 0

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

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

10 = y^1

y = 10

y = 10

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