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