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k in (-oo:+oo)
13/2-(2*k) = k-k-(3/2) // - k-k-(3/2)
k-(2*k)-k+13/2+3/2 = 0
k-2*k-k+13/2+3/2 = 0
8-2*k = 0 // - 8
-2*k = -8 // : -2
k = -8/(-2)
k = 4
k = 4
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