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Expression X-Sums Sudoku (1202)
Instruction:
Apply classic sudoku rules. The clues outside the grid indicate the sum of the first X digits placed in the corresponding direction, where X is equal to the first digit placed in that direction. There are different letters and mathematical expressions (consisting of only +, -, x and /) inside and outside the grid. Each letter represents a positive integer. Different letters may take on the same value.