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