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5, 7, 9
15.
The answer is 7.1 2+3+4+5+6+7+8+9+9+17/10=7.1
It is (9 + 9 + 7 + 7)/4 = 8
34 - 7 - 9 = 34 - 16 = 18 3(7 - 4) + 9 = 9 + 9 = 18 (7 - 4) x (9 - 3) = 3 x 6 = 18