No2 Раскройте скобки и приведите подобные слагаемые:
а) (2 + 7y) + (15 -7y)
б) 14b — (15b +y) — (у + 10b)
в) 9x + 3(15 – 8x)
г) 33 – 8(11b – 1) - 2b
д) b— (2c - (3b – 4с))
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