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LogicalApple
 one year ago
Best ResponseYou've already chosen the best response.0I suppose the additive identity. You are either replacing "6 + 0" with "6", or you are replacing "0 + 5" with "5". In either case, you are using the additive identity.

skullpatrol
 one year ago
Best ResponseYou've already chosen the best response.0The "Identity property of addition" justifies your equation because it states: There is a unique real real number 0 such that for every real number a, a+0=a and 0+a=a.
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