640/x=21

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Solution for 640/x=21 equation: 


D( x )

x = 0

x = 0

x = 0

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

640/x = 21 // - 21

640/x-21 = 0

640*x^-1 = 21 // : 640

x^-1 = 21/640

-1 < 0

1/(x^1) = 21/640 // * x^1

1 = 21/640*x^1 // : 21/640

640/21 = x^1

x = 640/21

x = 640/21

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