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k in (-oo:+oo)
-(5*k)-7 = 4*k-61 // - 4*k-61
61-(5*k)-(4*k)-7 = 0
61-5*k-4*k-7 = 0
54-9*k = 0 // - 54
-9*k = -54 // : -9
k = -54/(-9)
k = 6
k = 6
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