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12 -4 1 0 | 0 f1
3 -2 1 0 | 0 f2
-8 4 -2 1 | 21 f3
-1 1 -1 1 | 6 f4
12 -4 1 0 | 0 f1
3 -2 1 0 | 0 f2
-7 3 -1 0 | 15 f3-f4
-1 1 -1 1 | 6 f4 Pivote o fija
5 -1 0 0 | 15 f1+f3
-4 1 0 0 | 15 f2+f3
-7 3 -1 0 | 15 f3 Pivote
-1 1 -1 1 | 6 f4
1 0 0 0 | 30 f1+f2 a=30
-4 1 0 0 | 15 f2 Pivote -4(30)+b= 15 --> b=135
-7 3 -1 0 | 15 f3 -7(30)+3(135)-c=15 --> c=180
-1 1 -1 1 | 6 f4 -30+135-180+d=6 --> d = 81