3=21/y

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Solution for 3=21/y equation: 


D( y )

y = 0

y = 0

y = 0

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

3 = 21/y // - 21/y

3-(21/y) = 0

3-21*y^-1 = 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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