7-4=3, 7+4=11, 7-4=1, , 5+7+3=15, 5+7=12, 7+3=10, , 10+8=15, 10-8=2, 10+8=18, , 7-4=3, 7+4=11, 7-3=4, , 3+3=6, 3+3+3=9, 6-3=3, , 3-1=2, 3+1=5, 3+1=4, , 2+3=5, 2+3=6, 5+3=8.

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