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k in (-oo:+oo)
1-5*k = 31-2*k // - 31-2*k
1-5*k-(-2*k)-31 = 0
2*k-5*k-31+1 = 0
-3*k-30 = 0 // + 30
-3*k = 30 // : -3
k = 30/(-3)
k = -10
k = -10
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