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x in (-oo:+oo)
L = (1/2)*(p-(2*W)) // - (1/2)*(p-(2*W))
L-((1/2)*(p-(2*W))) = 0
(-1/2)*(p-2*W)+L = 0
L-1/2*(p-2*W) = 0
L-1/2*(p-2*W) = 0
L+W-1/2*p = 0
L+W-1/2*p = 0
x belongs to the empty set
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