21/x=-3

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Solution for 21/x=-3 equation: 


D( x )

x = 0

x = 0

x = 0

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

21/x = -3 // + 3

21/x+3 = 0

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

x^-1 = -1/7

-1 < 0

1/(x^1) = -1/7 // * x^1

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

-7 = x^1

x = -7

x = -7

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