3/4=5/y

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Solution for 3/4=5/y equation: 


D( y )

y = 0

y = 0

y = 0

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

3/4 = 5/y // - 5/y

3/4-(5/y) = 0

3/4-5*y^-1 = 0

-5*y^-1 = -3/4 // : -5

y^-1 = 3/20

-1 < 0

1/(y^1) = 3/20 // * y^1

1 = 3/20*y^1 // : 3/20

20/3 = y^1

y = 20/3

y = 20/3

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