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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(2/x)+4 = x+2/x+12 // - x+2/x+12
x-x-(2/x)-(2/x)-12+4 = 0
x-x-2*x^-1-2*x^-1-12+4 = 0
-4*x^-1 = 8 // : -4
x^-1 = -2
-1 < 0
1/(x^1) = -2 // * x^1
1 = -2*x^1 // : -2
-1/2 = x^1
x = -1/2
x = -1/2
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