15/45=-4/y

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Solution for 15/45=-4/y equation: 


D( y )

y = 0

y = 0

y = 0

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

15/45 = -4/y // + -4/y

15/45-(-4/y) = 0

4*y^-1+15/45 = 0

4*y^-1 = -1/3 // : 4

y^-1 = -1/12

-1 < 0

1/(y^1) = -1/12 // * y^1

1 = -1/12*y^1 // : -1/12

-12 = y^1

y = -12

y = -12

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