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k in (-oo:+oo)
(5/6)*k+2/5 = 37/30 // - 37/30
(5/6)*k+2/5-(37/30) = 0
(5/6)*k+2/5-37/30 = 0
5/6*k-5/6 = 0 // + 5/6
5/6*k = 5/6 // : 5/6
k = 5/6/5/6
k = 1
k = 1
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