The answer is 7 and 10.
7+10=17
10-7=3
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9 and 8 because if you add them you get 17 and if you subtract them you get 1
17 and 5
17 AND 11
The numbers are 18 and -17 because 18-(-17) = 35 and 18+(-17) = 1
Take 13 and 17 as an example. Sum is 13 + 17 ie 30, product is 13 x 17 = 221