3/y=9/21

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Solution for 3/y=9/21 equation: 


D( y )

y = 0

y = 0

y = 0

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

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

3/y-(9/21) = 0

3/y-3/7 = 0

3*y^-1 = 3/7 // : 3

y^-1 = 1/7

-1 < 0

1/(y^1) = 1/7 // * y^1

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

7 = y^1

y = 7

y = 7

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