Т = 20 * 3 − 4 = 60 − 4 = 56;
Я = (62 + 18) : 16 = 80 : 16 = 5;
М = 83 + 56 : 7 = 83 + 8 = 91;
Ч = 40 * 9 : 20 = 360 : 20 = 18;
У = 9 * 7 − 5 * 4 = 63 − 20 = 43;
Н = (93 − 18) : 25 = 75 : 25 = 3;
К = 400 * 7 : 140 = 2800 : 140 = 20;
А = 16 * 3 : 6 * 12 = 48 : 6 * 12 = 8 * 12 = 96;
В = 8 * (350 : 7) : 10 = 8 * 50 : 10 = 400 : 10 = 40;
И = 128 : 2 : 8 * 90 = 64 : 8 * 90 = 8 * 90 = 720;
Л = (60 * 40) : 800 * 9 = 2400 : 800 * 9 = 3 * 9 = 27;
Е = (60 − 54 : 6) : 3 = (60 − 9) : 3 = 51 : 3 = 17;
Ж = (520 − 70) : 9 − 36 = 450 : 9 − 36 = 50 − 36 = 14;
Ь = 18 * 2 : 6 * 7 + 29 = 36 : 6 * 7 + 29 = 6 * 7 + 29 = 42 + 29 = 71;
Р = 34 * (36 : 9) + 14 = 34 * 4 + 14 = 136 + 14 = 150;
Ы = (20 − 13) * (15 + 5) = 7 * 20 = 140;
Б = 9 * 2 * 9 * 5 − 610 = 18 * 9 * 5 − 610 = 162 * 5 − 610 = 810 − 610 = 200;
О = (4 * 40 + 330) : 70 = (160 + 330) : 70 = 490 : 70 = 7;
Й = (395 + 64) + (36 + 5) = 459 + 41 = 500;
С = 58 : 58 * 36 − 0 * (17 * 45) = 1 * 36 − 0 = 36.

Ответ: Алексей Толстой, Братья Жемчужниковы.