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