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x in (-oo:+oo)
q = (p-20)/5 // - (p-20)/5
q-((p-20)/5) = 0
(-1*(p-20))/5+q = 0
(-1*(p-20))/5+(5*q)/5 = 0
5*q-1*(p-20) = 0
5*q-p+20 = 0
(5*q-p+20)/5 = 0
(5*q-p+20)/5 = 0 // * 5
5*q-p+20 = 0
x belongs to the empty set
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