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subtraction
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subtraction

Taking one number or quantity away from another, or finding the difference between two quantities; it is one of the four basic operations of arithmetic. Subtraction is neither commutative:

a − b ≠ b − a

nor associative:

a − (b − c) ≠ (a − b) − c.

For example,

8 − 5 ≠ 5 − 8

7 − (4 − 3) ≠ (7 − 4) − 3.
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