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k in (-oo:+oo)
4-(6*k) = 64 // - 64
4-(6*k)-64 = 0
4-6*k-64 = 0
-6*k-60 = 0 // + 60
-6*k = 60 // : -6
k = 60/(-6)
k = -10
k = -10
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