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[ 7 0 0]
[ 0 -2 4]
[ 0 6 0]
[a b c]
[a b c]
[a b c]
[1 0 0]
[0 1 0]
[0 0 1]
(L - 7)*(L*(L + 2) - 24)
(L - a)*((L - b)*(L - c) - b*c) + b*(-a*(L - c) - a*c) - c*(a*(L - b) + a*b)
[L == -6, L == 4, L == 7]
[L == c + b + a, L == 0]
[7, 4, -6]
[c + b + a, 0]