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k in (-oo:+oo)
k-(7*k)+10 = 46 // - 46
k-(7*k)-46+10 = 0
k-7*k-46+10 = 0
-6*k-36 = 0 // + 36
-6*k = 36 // : -6
k = 36/(-6)
k = -6
k = -6
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