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Anonymous
9 - 31/2 = 51/2
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3 quarters is 9 twelfths, so 9 twelfths minus 3 twelfths is 6 twelfths, which is also a half.
9 - -3 = 9 + 3 = 12 12 - 8 = 4 9 - -3 - 8 = 4
one half
-9
2 - (-9) - 8 = 3