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k in (-oo:+oo)
k/3.2 = -4 // + 4
k/3.2+4 = 0
0.3125*k+4 = 0 // - 4
0.3125*k = -4 // : 0.3125
k = -4/0.3125
k = -12.8
k = -12.8
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