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k in (-oo:+oo)
5-7*k = 41-4*k // - 41-4*k
5-7*k-(-4*k)-41 = 0
4*k-7*k-41+5 = 0
-3*k-36 = 0 // + 36
-3*k = 36 // : -3
k = 36/(-3)
k = -12
k = -12
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