3/x=15/21

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Solution for 3/x=15/21 equation: 


D( x )

x = 0

x = 0

x = 0

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

3/x = 15/21 // - 15/21

3/x-(15/21) = 0

3/x-5/7 = 0

3*x^-1 = 5/7 // : 3

x^-1 = 5/21

-1 < 0

1/(x^1) = 5/21 // * x^1

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

21/5 = x^1

x = 21/5

x = 21/5

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