21(6)=7/x

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Solution for 21(6)=7/x equation: 


D( x )

x = 0

x = 0

x = 0

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

6*21 = 7/x // - 7/x

6*21-(7/x) = 0

6*21-7*x^-1 = 0

-7*x^-1 = -126 // : -7

x^-1 = 18

-1 < 0

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

1 = 18*x^1 // : 18

1/18 = x^1

x = 1/18

x = 1/18

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