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k in (-oo:+oo)
2*k-5 = 5*k-41 // - 5*k-41
2*k-(5*k)-5+41 = 0
2*k-5*k-5+41 = 0
36-3*k = 0 // - 36
-3*k = -36 // : -3
k = -36/(-3)
k = 12
k = 12
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