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Why does 31- -20 equals 51?

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Anonymous

∙ 14y ago
Updated: 8/19/2019

Because subtracting a negative number is the same as adding a positive number.

Subtracting -20 is the same as adding +20.

31 - (-20) = 31 + 20 = 51

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Wiki User

∙ 14y ago
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