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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-x+12/3 = x+16/x+5 // - x+16/x+5
x-x-x-(16/x)+12/3-5 = 0
x-x-x-16*x^-1+12/3-5 = 0
-1*x^1-16*x^-1-1*x^0 = 0
(-1*x^2-1*x^1-16*x^0)/(x^1) = 0 // * x^2
x^1*(-1*x^2-1*x^1-16*x^0) = 0
x^1
-x^2-x-16 = 0
-x^2-x-16 = 0
DELTA = (-1)^2-(-16*(-1)*4)
DELTA = -63
DELTA < 0
x in { }
x belongs to the empty set
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