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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100 = 100*(12000/x) // - 100*(12000/x)
100-(100*(12000/x)) = 0
100-1200000*x^-1 = 0
-1200000*x^-1 = -100 // : -1200000
x^-1 = 1/12000
-1 < 0
1/(x^1) = 1/12000 // * x^1
1 = 1/12000*x^1 // : 1/12000
12000 = x^1
x = 12000
x = 12000
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