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k in (-oo:+oo)
k+3 = 7*k-69 // - 7*k-69
k-(7*k)+3+69 = 0
k-7*k+3+69 = 0
72-6*k = 0 // - 72
-6*k = -72 // : -6
k = -72/(-6)
k = 12
k = 12
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