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k in (-oo:+oo)
(5/6)*k-((3/4)*k)+10 = 61/6 // - 61/6
(5/6)*k-((3/4)*k)-(61/6)+10 = 0
(5/6)*k+(-3/4)*k-61/6+10 = 0
1/12*k-1/6 = 0 // + 1/6
1/12*k = 1/6 // : 1/12
k = 1/6/1/12
k = 2
k = 2
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