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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1600000000/x = 16000 // - 16000
1600000000/x-16000 = 0
1600000000*x^-1 = 16000 // : 1600000000
x^-1 = 1/100000
-1 < 0
1/(x^1) = 1/100000 // * x^1
1 = 1/100000*x^1 // : 1/100000
100000 = x^1
x = 100000
x = 100000
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