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k in (-oo:+oo)
-5*k-(7*k)-9 = -105 // + 105
105-5*k-(7*k)-9 = 0
105-5*k-7*k-9 = 0
96-12*k = 0 // - 96
-12*k = -96 // : -12
k = -96/(-12)
k = 8
k = 8
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