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