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\( 31 - 15 = 16 \)
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To evaluate \( 31 - 5 \times 3 \), we need to follow the order of operations, often remembered by the acronym PEMDAS (Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right)). First, we perform the multiplication: \( 5 \times 3 = 15 \). Next, we subtract that result from 31: \( 31 - 15 = 16 \). Therefore, the final answer is \( 16 \).