-5/7=15/x

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Solution for -5/7=15/x equation: 


D( x )

x = 0

x = 0

x = 0

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

-5/7 = 15/x // - 15/x

-(15/x)-5/7 = 0

-15*x^-1-5/7 = 0

-15*x^-1 = 5/7 // : -15

x^-1 = -1/21

-1 < 0

1/(x^1) = -1/21 // * x^1

1 = -1/21*x^1 // : -1/21

-21 = x^1

x = -21

x = -21

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