-21=6/y

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Solution for -21=6/y equation: 


D( y )

y = 0

y = 0

y = 0

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

-21 = 6/y // - 6/y

-(6/y)-21 = 0

-6*y^-1-21 = 0

-6*y^-1 = 21 // : -6

y^-1 = -7/2

-1 < 0

1/(y^1) = -7/2 // * y^1

1 = -7/2*y^1 // : -7/2

-2/7 = y^1

y = -2/7

y = -2/7

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