4/5=2/y

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Solution for 4/5=2/y equation: 


D( y )

y = 0

y = 0

y = 0

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

4/5 = 2/y // - 2/y

4/5-(2/y) = 0

4/5-2*y^-1 = 0

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

y^-1 = 2/5

-1 < 0

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

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

5/2 = y^1

y = 5/2

y = 5/2

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