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