To simplify the expression \(12815 - 7 + 715 + 15\), follow these steps:
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Start with the subtraction: \[ 12815 - 7 = 12808 \]
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Then add \(715\): \[ 12808 + 715 = 13523 \]
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Finally, add \(15\): \[ 13523 + 15 = 13538 \]
So, the simplified answer is \(13538\).