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k in (-oo:+oo)
-24 = 3*k+7*k+6 // - 3*k+7*k+6
-(3*k)-(7*k)-24-6 = 0
-3*k-7*k-24-6 = 0
-10*k-30 = 0 // + 30
-10*k = 30 // : -10
k = 30/(-10)
k = -3
k = -3
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