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Ana
a) | 2 4 1 | | 2 4 x | = 0 | 3 1 2 |
b) | 2 3 -2 | | 0 1 x | = 2 | 2 x -3 |
c) | x+1 3 x | | 3 x 1 | = 0 | x 2 x-1|
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