21/y=3

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Solution for 21/y=3 equation: 


D( y )

y = 0

y = 0

y = 0

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

21/y = 3 // - 3

21/y-3 = 0

21*y^-1 = 3 // : 21

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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