12/9=20/y

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Solution for 12/9=20/y equation: 


D( y )

y = 0

y = 0

y = 0

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

12/9 = 20/y // - 20/y

12/9-(20/y) = 0

12/9-20*y^-1 = 0

-20*y^-1 = -4/3 // : -20

y^-1 = 1/15

-1 < 0

1/(y^1) = 1/15 // * y^1

1 = 1/15*y^1 // : 1/15

15 = y^1

y = 15

y = 15

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