min z = x1 - x2 + x3
x1 + 2x2 - x3 ≤ 3
- x1 + x2 + x3 ≥ 2
x1 - x2 = 10
x1 ≥ 0, x2 ≥ 0
Convert the problem into a standard maximum problem and then write its dual form.
Please write the answer clearly and legibly
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