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k in (-oo:+oo)
k/4 = 0.3 // - 0.3
k/4-0.3 = 0
1/4*k-0.3 = 0 // + 0.3
1/4*k = 0.3 // : 1/4
k = 0.3/1/4
k = 1.2
k = 1.2
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