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k in (-oo:+oo)
31 = 5*k-k-5 // - 5*k-k-5
k-(5*k)+5+31 = 0
k-5*k+5+31 = 0
36-4*k = 0 // - 36
-4*k = -36 // : -4
k = -36/(-4)
k = 9
k = 9
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