1.209
1.210
1.211
1.212
1.213
⎩⎨⎧−4x+y≤1−x+2y≤9x+y≤12x−y≤4x−6y≤−6
⎩⎨⎧y≤4x+12y≤x+9 /:2y≤−x+12y≥x−46y≥x+6 /:6
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