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K in (-oo:+oo)
K/6.5 = -4 // + 4
K/6.5+4 = 0
0.15384615*K+4 = 0 // - 4
0.15384615*K = -4 // : 0.15384615
K = -4/0.15384615
K = -26.00000065
K = -26.00000065
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