Ответ:
1) cd- 3c - 4d + 12
2) - 2a - 2a +10a +20
3) 2x + x + yx + y
4) p + pq - q - qp
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Ответ:
1) cd- 3c - 4d + 12
2) - 2a - 2a +10a +20
3) 2x + x + yx + y
4) p + pq - q - qp