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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x = 50000 // - 50000
12/x-50000 = 0
12*x^-1 = 50000 // : 12
x^-1 = 12500/3
-1 < 0
1/(x^1) = 12500/3 // * x^1
1 = 12500/3*x^1 // : 12500/3
3/12500 = x^1
x = 3/12500
x = 3/12500
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