5=-4/y-21

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Solution for 5=-4/y-21 equation: 


D( y )

y = 0

y = 0

y = 0

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

5 = -4/y-21 // + -4/y-21

5-(-4/y)+21 = 0

4*y^-1+5+21 = 0

4*y^-1 = -26 // : 4

y^-1 = -13/2

-1 < 0

1/(y^1) = -13/2 // * y^1

1 = -13/2*y^1 // : -13/2

-2/13 = y^1

y = -2/13

y = -2/13

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