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x in (-oo:+oo)
t = 25-((1/2)*(w-k)) // - 25-((1/2)*(w-k))
(1/2)*(w-k)+t-25 = 0
1/2*(w-k)+t-25 = 0
1/2*(w-k)+t-25 = 0
t-1/2*k+1/2*w-25 = 0
t-1/2*k+1/2*w-25 = 0
x belongs to the empty set
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