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k in (-oo:+oo)
9/2 = -k/2 // + -k/2
9/2-(-k/2) = 0
(1/2)*k+9/2 = 0
1/2*k+9/2 = 0 // - 9/2
1/2*k = -9/2 // : 1/2
k = -9/2/1/2
k = -9
k = -9
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