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k in (-oo:+oo)
5*(4-(6*k)) = 260 // - 260
5*(4-(6*k))-260 = 0
5*(4-6*k)-260 = 0
5*(4-6*k)-260 = 0
-30*k-240 = 0
-30*k-240 = 0
-30*k-240 = 0 // + 240
-30*k = 240 // : -30
k = 240/(-30)
k = -8
k = -8
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