4) 21a - 18 + 32b - 22b+ 9a + 18 = ?

5) 23 - 13a + 18b - 12b + 20a + 17 = ?

6) 40b - 23a + 30a - 40b + 12 = ? ПЖ СРОЧНОООО ДАЮ ВСЕ-ЧТО ЕСТЬ)
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