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k in (-oo:+oo)
5*k-5/8 = (5/6)*k-(5/8) // - (5/6)*k-(5/8)
5*k-((5/6)*k)-5/8+5/8 = 0
5*k+(-5/6)*k-5/8+5/8 = 0
25/6*k = 0 // : 25/6
k = 0
k = 0
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