7/y=21

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Solution for 7/y=21 equation: 


D( y )

y = 0

y = 0

y = 0

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

7/y = 21 // - 21

7/y-21 = 0

7*y^-1 = 21 // : 7

y^-1 = 3

-1 < 0

1/(y^1) = 3 // * y^1

1 = 3*y^1 // : 3

1/3 = y^1

y = 1/3

y = 1/3

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