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k in (-oo:+oo)
-(6*k)-8 = 6*k-56 // - 6*k-56
56-(6*k)-(6*k)-8 = 0
56-6*k-6*k-8 = 0
48-12*k = 0 // - 48
-12*k = -48 // : -12
k = -48/(-12)
k = 4
k = 4
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