3/5=-21/x

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Solution for 3/5=-21/x equation: 


D( x )

x = 0

x = 0

x = 0

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

3/5 = -21/x // + -21/x

3/5-(-21/x) = 0

21*x^-1+3/5 = 0

21*x^-1 = -3/5 // : 21

x^-1 = -1/35

-1 < 0

1/(x^1) = -1/35 // * x^1

1 = -1/35*x^1 // : -1/35

-35 = x^1

x = -35

x = -35

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