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(20 8/15 * 7 1/2 - 54 3/5 * 2/5) : (3 13/21 * 8 2/5 - 29 2/5) - 5/6 * 1 1/5 + 21/25 =   =132

1)  20 8/15 * 7 1/2 = 308/15 * 15/2 = 154

2)  54 3/5 * 2/5 = 273/5 * 2/5 = 546/25

3) 154 - 546/25 = 3850/25 -546/25 = 3304/25

4)  3 13/21 * 8 2/5 = 76/21 * 42/5 = 152/5

5)  152/5 - 29 2/5 = 152/5 - 147/5 = 5/5 = 1

6)  5/6 * 1 1/5 = 5/6 * 6*5 = 1

7)  3304/25 : 1 = 3304/25

8) 3304/25 - 1 =  3304/25 - 25/25 = 3279/25

9) 3279/25 + 21/25 = 3300/25 = 132