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k in (-oo:+oo)
(3/2)*k = 15/4 // - 15/4
(3/2)*k-(15/4) = 0
(3/2)*k-15/4 = 0
3/2*k-15/4 = 0 // + 15/4
3/2*k = 15/4 // : 3/2
k = 15/4/3/2
k = 5/2
k = 5/2
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