4/5=15/y

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Solution for 4/5=15/y equation: 


D( y )

y = 0

y = 0

y = 0

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

4/5 = 15/y // - 15/y

4/5-(15/y) = 0

4/5-15*y^-1 = 0

-15*y^-1 = -4/5 // : -15

y^-1 = 4/75

-1 < 0

1/(y^1) = 4/75 // * y^1

1 = 4/75*y^1 // : 4/75

75/4 = y^1

y = 75/4

y = 75/4

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