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x in (-oo:+oo)
P = (b+c)/5 // - (b+c)/5
P-((b+c)/5) = 0
(-1*(b+c))/5+P = 0
(-1*(b+c))/5+(5*P)/5 = 0
5*P-1*(b+c) = 0
5*P-b-c = 0
(5*P-b-c)/5 = 0
(5*P-b-c)/5 = 0 // * 5
5*P-b-c = 0
x belongs to the empty set
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