5/15+3/15=12/15-4/15
9/15+2/15=7/15+4/15
8/15-2/15=2/15+4/15
3/15+4/15=9/15-2/15
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5/15+3/15=12/15-4/15
9/15+2/15=7/15+4/15
8/15-2/15=2/15+4/15
3/15+4/15=9/15-2/15