D. When adding two numbers, such as 123 and 423, care is taken to first line them up and then add like digits. How does expanding this expression to [ (1 * 102) + (2 * 101) + (3 * 100) ] + [ (4 * 102) + (2 * 101) + (3 * 100) ] make the operation more like a polynomial addition problem?
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