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k in (-oo:+oo)
(1/4)*k = -2.5 // + 2.5
(1/4)*k+2.5 = 0
1/4*k+2.5 = 0 // - 2.5
1/4*k = -2.5 // : 1/4
k = -2.5/1/4
k = -10
k = -10
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