1. Упростить выражение: а) 11у +7+5y + 20 б) 14 – (6c + 5) в) 8y + (9 – 8y) — 19 г) 3(6x – 7) – 13y + 11
2. Доказать тождество: 6(7y + 10) – (у – 12) + (- 41y+28) = 100
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