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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.06 = 12/x // - 12/x
0.06-(12/x) = 0
0.06-12*x^-1 = 0
-12*x^-1 = -0.06 // : -12
x^-1 = 0.005
-1 < 0
1/(x^1) = 0.005 // * x^1
1 = 0.005*x^1 // : 0.005
200 = x^1
x = 200
x = 200
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