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-3 * detM12 + 2 * detM42 =
-3 *( (18+0+0) - (0 + 0+ 12)) + 2* ( (0+12+0) - (8+0+0)) = -3 * (18-12) + 2 * (12 - 8) = -3 * 6 + 2 * 4 = -18 + 8 = -10