x plus 4 equals 7
215-149
ascending order 1 2/7 3/2 6/14
7.2×25÷10
ascending order 2/9 1/3 7/6 1/2
(0, 1) , (4, -1)
(7, 9) + (3, -5)
ascending order 11/15 1/6 5/10 4/3
15
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30
14008-4800
