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k in (-oo:+oo)
(3/4)*k = 5/8 // - 5/8
(3/4)*k-(5/8) = 0
(3/4)*k-5/8 = 0
3/4*k-5/8 = 0 // + 5/8
3/4*k = 5/8 // : 3/4
k = 5/8/3/4
k = 5/6
k = 5/6
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