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D( x )
x = 0
x-1 = 0
x = 0
x = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:0) U (0:1) U (1:+oo)
2/x-3-1 = (2*x+1)/(x-1) // - (2*x+1)/(x-1)
2/x-((2*x+1)/(x-1))-3-1 = 0
(-1*(2*x+1))/(x-1)+2/x-3-1 = 0
(-1*x*(2*x+1))/(x*(x-1))+(2*(x-1))/(x*(x-1))+(-3*x*(x-1))/(x*(x-1))+(-1*x*(x-1))/(x*(x-1)) = 0
2*(x-1)-1*x*(2*x+1)-3*x*(x-1)-1*x*(x-1) = 0
x-2*x^2-3*x^2-x^2+3*x+x-2 = 0
4*x-5*x^2-x^2+x-2 = 0
5*x-6*x^2-2 = 0
5*x-6*x^2-2 = 0
5*x-6*x^2-2 = 0
DELTA = 5^2-(-6*(-2)*4)
DELTA = -23
DELTA < 0
1 = 0
1/(x*(x-1)) = 0
1/(x*(x-1)) = 0 // * x*(x-1)
1 = 0
x belongs to the empty set
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