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k in (-oo:+oo)
15 = -k/4-9 // + -k/4-9
9-(-k/4)+15 = 0
(1/4)*k+9+15 = 0
1/4*k+24 = 0 // - 24
1/4*k = -24 // : 1/4
k = -24/1/4
k = -96
k = -96
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