18/21=6/x

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Solution for 18/21=6/x equation: 


D( x )

x = 0

x = 0

x = 0

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

18/21 = 6/x // - 6/x

18/21-(6/x) = 0

18/21-6*x^-1 = 0

-6*x^-1 = -6/7 // : -6

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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