Simple calculation of 11 / 9-1 / 2 / 4 / 5-3 / 8
11/9-1/2/4/5-3/8
=11/9-1/2*5/4-3/8
=11/9-5/8-3/8
=11/9-(5/8+3/8)
=11/9-1
=2/9
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