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k in (-oo:+oo)
3/2 = (9/2)*k // - (9/2)*k
3/2-((9/2)*k) = 0
(-9/2)*k+3/2 = 0
3/2-9/2*k = 0 // - 3/2
-9/2*k = -3/2 // : -9/2
k = -3/2/(-9/2)
k = 1/3
k = 1/3
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