4000/21/2=720/x

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Solution for 4000/21/2=720/x equation: 


D( x )

x = 0

x = 0

x = 0

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

(4000/21)/2 = 720/x // - 720/x

(4000/21)/2-(720/x) = 0

(4000/21)/2-720*x^-1 = 0

-720*x^-1 = -2000/21 // : -720

x^-1 = 25/189

-1 < 0

1/(x^1) = 25/189 // * x^1

1 = 25/189*x^1 // : 25/189

189/25 = x^1

x = 189/25

x = 189/25

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