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k in (-oo:+oo)
7-7*k = (5/6)*k+68/3 // - (5/6)*k+68/3
7-7*k-((5/6)*k)-(68/3) = 0
(-5/6)*k-7*k-68/3+7 = 0
-47/6*k-47/3 = 0 // + 47/3
-47/6*k = 47/3 // : -47/6
k = 47/3/(-47/6)
k = -2
k = -2
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