5/x=7/21

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Solution for 5/x=7/21 equation: 


D( x )

x = 0

x = 0

x = 0

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

5/x = 7/21 // - 7/21

5/x-(7/21) = 0

5/x-1/3 = 0

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

x^-1 = 1/15

-1 < 0

1/(x^1) = 1/15 // * x^1

1 = 1/15*x^1 // : 1/15

15 = x^1

x = 15

x = 15

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