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k in (-oo:+oo)
(2/3)*k = 12/20 // - 12/20
(2/3)*k-(12/20) = 0
(2/3)*k-3/5 = 0
2/3*k-3/5 = 0 // + 3/5
2/3*k = 3/5 // : 2/3
k = 3/5/2/3
k = 9/10
k = 9/10
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