5*9=(105/x)*9

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Solution for 5*9=(105/x)*9 equation: 


D( x )

x = 0

x = 0

x = 0

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

5*9 = 9*(105/x) // - 9*(105/x)

5*9-(9*(105/x)) = 0

5*9-945*x^-1 = 0

-945*x^-1 = -45 // : -945

x^-1 = 1/21

-1 < 0

1/(x^1) = 1/21 // * x^1

1 = 1/21*x^1 // : 1/21

21 = x^1

x = 21

x = 21

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