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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1000000/x = 0.5 // - 0.5
1000000/x-0.5 = 0
1000000*x^-1 = 0.5 // : 1000000
x^-1 = 0.0000005
-1 < 0
1/(x^1) = 0.0000005 // * x^1
1 = 0.0000005*x^1 // : 0.0000005
2000000 = x^1
x = 2000000
x = 2000000
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