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k in (-oo:+oo)
10 = (-1/2)*k // - (-1/2)*k
10-((-1/2)*k) = 0
(1/2)*k+10 = 0
1/2*k+10 = 0 // - 10
1/2*k = -10 // : 1/2
k = -10/1/2
k = -20
k = -20
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