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k in (-oo:+oo)
-6*k-(5/9) = (1/4)*k-1595/36 // - (1/4)*k-1595/36
-6*k-((1/4)*k)-(5/9)-(-1595/36) = 0
(-1/4)*k-6*k-5/9+1595/36 = 0
175/4-25/4*k = 0 // - 175/4
-25/4*k = -175/4 // : -25/4
k = -175/4/(-25/4)
k = 7
k = 7
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