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k in (-oo:+oo)
1-5*k = -(3*k)-13 // + -(3*k)-13
3*k-5*k+1+13 = 0
14-2*k = 0 // - 14
-2*k = -14 // : -2
k = -14/(-2)
k = 7
k = 7
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