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K in (-oo:+oo)
K/3 = -1.5 // + 1.5
K/3+1.5 = 0
1/3*K+1.5 = 0 // - 1.5
1/3*K = -1.5 // : 1/3
K = -1.5/1/3
K = -4.50000005
K = -4.50000005
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