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k in (-oo:+oo)
0.5 = (7/2)*k // - (7/2)*k
0.5-((7/2)*k) = 0
(-7/2)*k+0.5 = 0
0.5-7/2*k = 0 // - 0.5
-7/2*k = -0.5 // : -7/2
k = -0.5/(-7/2)
k = 0.14285714
k = 0.14285714
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