(9 17 8 9) ,(18 37 15 20 ), (26 28 18 ?)
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this may 8....?
(9 17 8 9) ,(18 37 15 20 ), (26 28 18 8)
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18
Step-by-step explanation:
9+17-8/2=9,18+37-15/2=20,26+28-18=18
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