16by 17 of 34by5 ,-21 by 5, -15by141by2+1by 7
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3+2=7 (3*2=6+1)
5+4=23 (5*4=20+3)
7+6=47 (7*6=42+5)
9+8=79 (9*8=72+7)
10+9=99 (10*9=90+9) --- Answer
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