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Subtract

Subtraction is the operation of deducting one number from another; the inverse of addition.
If a and b are real numbers, then the number a-b is the number (called the difference) which when added to b (the subtractor) equals a (the subtrahend).
So, the subtraction of b from a is the same as the addition of a and the inverse of b, or a-b=a+(-b).
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