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Why can you calculate (-20) plus ( plus 8) by calculating 20-8 and taking the opposite of your result?
Wiki User
∙ 8y ago
Since addition is commutative, -20 + 8 is the same as 8 + -20.
8 + -20 is the same as 8 - 20.
8 - 20 will give you the opposite number of 20 - 8.
Wiki User
∙ 8y ago
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