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k in (-oo:+oo)
(2/15)*k = 3/10 // - 3/10
(2/15)*k-(3/10) = 0
(2/15)*k-3/10 = 0
2/15*k-3/10 = 0 // + 3/10
2/15*k = 3/10 // : 2/15
k = 3/10/2/15
k = 9/4
k = 9/4
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