21/9=42/x

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Solution for 21/9=42/x equation: 


D( x )

x = 0

x = 0

x = 0

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

21/9 = 42/x // - 42/x

21/9-(42/x) = 0

21/9-42*x^-1 = 0

-42*x^-1 = -7/3 // : -42

x^-1 = 1/18

-1 < 0

1/(x^1) = 1/18 // * x^1

1 = 1/18*x^1 // : 1/18

18 = x^1

x = 18

x = 18

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