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k in (-oo:+oo)
1/4-((5/6)*k) = -39/4 // + -39/4
1/4-((5/6)*k)-(-39/4) = 0
(-5/6)*k+1/4+39/4 = 0
10-5/6*k = 0 // - 10
-5/6*k = -10 // : -5/6
k = -10/(-5/6)
k = 12
k = 12
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