3/11=21/x

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Solution for 3/11=21/x equation: 


D( x )

x = 0

x = 0

x = 0

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

3/11 = 21/x // - 21/x

3/11-(21/x) = 0

3/11-21*x^-1 = 0

-21*x^-1 = -3/11 // : -21

x^-1 = 1/77

-1 < 0

1/(x^1) = 1/77 // * x^1

1 = 1/77*x^1 // : 1/77

77 = x^1

x = 77

x = 77

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