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