0
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-21 + 14 = -7
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11 plus 5-10 plus 20-9 plus 14-10 is equal to 21
2/3 + 2/7 = 14/21 + 6/21 = 20/21
-8+(-21) = -29
(-44) + (-21) = -65
2/3 +4/7 = 14/21 + 12/21 = 26/21 = 1 5/21