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k in (-oo:+oo)
-5 = (-1/2)*k // - (-1/2)*k
-((-1/2)*k)-5 = 0
(1/2)*k-5 = 0
1/2*k-5 = 0 // + 5
1/2*k = 5 // : 1/2
k = 5/1/2
k = 10
k = 10
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