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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/100 = 6000/x // - 6000/x
16/100-(6000/x) = 0
16/100-6000*x^-1 = 0
-6000*x^-1 = -4/25 // : -6000
x^-1 = 1/37500
-1 < 0
1/(x^1) = 1/37500 // * x^1
1 = 1/37500*x^1 // : 1/37500
37500 = x^1
x = 37500
x = 37500
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