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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
150/x = 12/400 // - 12/400
150/x-(12/400) = 0
150/x-3/100 = 0
150*x^-1 = 3/100 // : 150
x^-1 = 1/5000
-1 < 0
1/(x^1) = 1/5000 // * x^1
1 = 1/5000*x^1 // : 1/5000
5000 = x^1
x = 5000
x = 5000
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