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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x+1/x-2 = 3/x-2 // - 3/x-2
3/x+1/x-(3/x)-2+2 = 0
3/x+1/x-3*x^-1-2+2 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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