Mathematics · Mathematical Operations

If '' means '×', '#' means '-', '@' means '+', and '' means '÷', then evaluate the expression: 39 @ 21 $ 3 # 56 7

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If '' means '&times;', '#' means '-', '@' means '+', and '*' means '&divide;', then evaluate the expression: 39 @ 21 $ 3 # 56 * 7