(3/8 + 2 1/7 * 1 1/20) * 1 1/3 = 3 1/2
1) 2 1/7 * 1 1/20 = 15/7 * 21/20 = 9/4
2) 3/8 + 9/4 = 3/8 + 18/8 = 21/8
3) 21/8 * 1 1/3 = 21/8 * 4/3 = 7/2 = 3 1/2
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(3/8 + 2 1/7 * 1 1/20) * 1 1/3 = 3 1/2
1) 2 1/7 * 1 1/20 = 15/7 * 21/20 = 9/4
2) 3/8 + 9/4 = 3/8 + 18/8 = 21/8
3) 21/8 * 1 1/3 = 21/8 * 4/3 = 7/2 = 3 1/2