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