2a+7b+13b+19a, 21a+19b, 21ab, 21a+20b, 19a+21b, 18b+23a, 17a+18b, (2a) x (8a), 6a, 10a, 10ab, 17ab, 16a, 16a 2, 799-800, 2, -2, -1, -3, 1, 5, if the ratio of boys and girls is of 7:3 and there are new pupils and now there are 84 girls, what si the ratio of boys?, 84:36, 36:84, 30:86, 48:84, 84:46, 64:09, 999999999-10000000, 1, 2, 3, -1, -2, -3, 3xy / 21x, 7xy, 1xy / 7xy, 7y, 7xy /1xy, (8xy), 9, 60 / 12, 6, 7, 1, 4, 5, 8, 900000+1, 9000001, 900001, 900100, 100000, 90000001, 901001, 9-8, -2, 2, 3, -1, 0, 1, bonus question! 4 x 12, `48, -48, .48, ...48, ..48, 48

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