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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x)/x+1 = ((2*x)/2)*x+2+4 // - ((2*x)/2)*x+2+4
(3*x)/x-(((2*x)/2)*x)-4-2+1 = 0
(3*x)/x-x^2-4-2+1 = 0
-1*x^2 = 2 // : -1
x^2 = -2
x belongs to the empty set
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