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x in (-oo:+oo)
q = (p+r)/2 // - (p+r)/2
q-((p+r)/2) = 0
(-1*(p+r))/2+q = 0
(-1*(p+r))/2+(2*q)/2 = 0
2*q-1*(p+r) = 0
2*q-p-r = 0
(2*q-p-r)/2 = 0
(2*q-p-r)/2 = 0 // * 2
2*q-p-r = 0
x belongs to the empty set
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