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Well lets write out the problem. 8 plus a (so 8+a) when a equals five (a=5). Since we know that a is the same thing as 5, you can just plug in a into the original equation.
8+a turns into 8+5. Then it's just simple arithmetic, 8+5=13. Your final answer is 13.

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15y ago

What else can I help you with?