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x in (-oo:+oo)
K/2-k-(4/2) = 5/4 // - 5/4
K/2-k-(4/2)-(5/4) = 0
K/2-k-5/4-2 = 0
1/2*K-k-13/4 = 0
x należy do R
x in (-oo:+oo)
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