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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.005 = 15750/x // - 15750/x
0.005-(15750/x) = 0
0.005-15750*x^-1 = 0
-15750*x^-1 = -0.005 // : -15750
x^-1 = 0.00000032
-1 < 0
1/(x^1) = 0.00000032 // * x^1
1 = 0.00000032*x^1 // : 0.00000032
3125000 = x^1
x = 3125000
x = 3125000
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