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k in (-oo:+oo)
(9/10)*k = 3/2 // - 3/2
(9/10)*k-(3/2) = 0
(9/10)*k-3/2 = 0
9/10*k-3/2 = 0 // + 3/2
9/10*k = 3/2 // : 9/10
k = 3/2/9/10
k = 5/3
k = 5/3
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