9/y=3/21

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Solution for 9/y=3/21 equation: 


D( y )

y = 0

y = 0

y = 0

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

9/y = 3/21 // - 3/21

9/y-(3/21) = 0

9/y-1/7 = 0

9*y^-1 = 1/7 // : 9

y^-1 = 1/63

-1 < 0

1/(y^1) = 1/63 // * y^1

1 = 1/63*y^1 // : 1/63

63 = y^1

y = 63

y = 63

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