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19
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Answer: 19
1 plus negative 10 is equal to -9.
11 plus 5-10 plus 20-9 plus 14-10 is equal to 21
no 9 + 10 = 19 11 + 10 = 21 9 + 12 = 21
2x+10=9+11-3x2x+10=20-3x5x+10=205x=10x=2
7/10 + 2/10 = 9/10