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x in (-oo:+oo)
A = (2/3)*(B+C) // - (2/3)*(B+C)
A-((2/3)*(B+C)) = 0
(-2/3)*(B+C)+A = 0
A-2/3*(B+C) = 0
A-2/3*(B+C) = 0
A-2/3*B-2/3*C = 0
A-2/3*B-2/3*C = 0
x belongs to the empty set
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