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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x = 120 // - 120
12/x-120 = 0
12*x^-1 = 120 // : 12
x^-1 = 10
-1 < 0
1/(x^1) = 10 // * x^1
1 = 10*x^1 // : 10
1/10 = x^1
x = 1/10
x = 1/10
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