16-4/y=21

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Solution for 16-4/y=21 equation: 


D( y )

y = 0

y = 0

y = 0

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

16-(4/y) = 21 // - 21

16-(4/y)-21 = 0

16-4*y^-1-21 = 0

-4*y^-1 = 5 // : -4

y^-1 = -5/4

-1 < 0

1/(y^1) = -5/4 // * y^1

1 = -5/4*y^1 // : -5/4

-4/5 = y^1

y = -4/5

y = -4/5

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