300+30(400/x)

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Solution for 300+30(400/x) equation: 


D( x )

x = 0

x = 0

x = 0

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

30*(400/x)+300 = 0

12000*x^-1 = -300 // : 12000

x^-1 = -1/40

-1 < 0

1/(x^1) = -1/40 // * x^1

1 = -1/40*x^1 // : -1/40

-40 = x^1

x = -40

x = -40

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