(20 1/5 - b) - 6 1/3=20 1/5 - b - 6 1/3=20 3/15 - 6 5/15 - b=13 13/15 - b
при b=11 2/15
13 13/15 - 11 2/15=2 11/15
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(20 1/5 - b) - 6 1/3=20 1/5 - b - 6 1/3=20 3/15 - 6 5/15 - b=13 13/15 - b
при b=11 2/15
13 13/15 - 11 2/15=2 11/15