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x in (-oo:+oo)
a = (1/2)*(b+b) // - (1/2)*(b+b)
a-((1/2)*(b+b)) = 0
(-1/2)*(b+b)+a = 0
a-1/2*2*b = 0
a-1/2*2*b = 0
a-b = 0
a-b = 0
x belongs to the empty set
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