15/40=-3/x

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Solution for 15/40=-3/x equation: 


D( x )

x = 0

x = 0

x = 0

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

15/40 = -3/x // + -3/x

15/40-(-3/x) = 0

3*x^-1+15/40 = 0

3*x^-1 = -3/8 // : 3

x^-1 = -1/8

-1 < 0

1/(x^1) = -1/8 // * x^1

1 = -1/8*x^1 // : -1/8

-8 = x^1

x = -8

x = -8

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