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x in (-oo:+oo)
W = (p-q)/r // - (p-q)/r
W-((p-q)/r) = 0
(-1*(p-q))/r+W = 0
(-1*(p-q))/r+(W*r)/r = 0
W*r-1*(p-q) = 0
W*r-p+q = 0
(W*r-p+q)/r = 0
(W*r-p+q)/r = 0 // * r
W*r-p+q = 0
x belongs to the empty set
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