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