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Subtraction is a mathematical operation that represents the operation of removing objects from a collection. It is signified by the minus sign (−). Subtraction represents removing or decreasing physical and abstract quantities using different kinds of objects including negative numbers, fractions, irrational numbers, vectors, decimals, functions, and matrices.

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"Substraction Calculator" Math.net. STANDS4 LLC, 2017. Web. 18 Dec. 2017. <http://www.math.net/calculators/substraction>.

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