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k in (-oo:+oo)
2-5*k-(7*k) = 110 // - 110
2-5*k-(7*k)-110 = 0
2-5*k-7*k-110 = 0
-12*k-108 = 0 // + 108
-12*k = 108 // : -12
k = 108/(-12)
k = -9
k = -9
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