Pandigital Sudoku

Via su.doku.es I found another variant of the famous Sudoku puzzles. It's called Pandigital Sudoku. You have to fill in the Sudoku grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. These are the original Sudoku rules. Additional the rows form 9 correct arithmetic expressions reading from left to right. There is only one solution to complete Pandigital Sudoku.

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