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max z = 5x1 + 6x2 + 7x3
2x1 + 4x2 + 6x3 ≤ 40
1x1 + 2x2 + 1x3 = 30
8x1 + 2x2 - 5x3 = 20
-1x1 + 2x2 - 3x3 ≥ 10
x2 ,
max z = 3x2 + 4x3
12x1 - 9x2 = 8
x1 - 3x2 + x3 = 10
8x1 - x2 + 10x3 = 22
- 2x1 + 9x2 + x3 ≥ 14
x1, x2, x3 ≥ 0
min z = 3x1 - 4x2 + 5x3
x1 + 6x2 + 4x3 = 14
4x2 + x3 ≥ 14
2x1 + 9x2 + 6x3 ≥ 21
- 7x1 + x2 ≤ 10
x1, x2 ≥ 0