15-7= - 8, 10+11+5= - 26, 2,4,6,8,...? - 10, 8+6= - 14, 13+ ? =20 - 7, 16+0= - 16, 11, 22, 33, 44,...? - 55, 18-9= - 9, ? -6=14 - 20, 20-3-2= - 15,

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