Ответ:
1. 12+х-у
2. a-a+b = b
3.2x+y+z
4.-14
5.a-b+c+d
6.-x+y-z+x-y=-z
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Ответ:
1. 12+х-у
2. a-a+b = b
3.2x+y+z
4.-14
5.a-b+c+d
6.-x+y-z+x-y=-z