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k in (-oo:+oo)
k/2-(10/2) = -7 // + 7
k/2-(10/2)+7 = 0
k/2-5+7 = 0
1/2*k+2 = 0 // - 2
1/2*k = -2 // : 1/2
k = -2/1/2
k = -4
k = -4
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