-4=40/x*20

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Solution for -4=40/x*20 equation: 


D( x )

x = 0

x = 0

x = 0

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

-4 = 20*(40/x) // - 20*(40/x)

-(20*(40/x))-4 = 0

-800*x^-1-4 = 0

-800*x^-1 = 4 // : -800

x^-1 = -1/200

-1 < 0

1/(x^1) = -1/200 // * x^1

1 = -1/200*x^1 // : -1/200

-200 = x^1

x = -200

x = -200

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