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Solve Puzzle

Rules

• Normal sudoku rules apply.
  Every row, column, and 3 × 3 box contains all digits 1-9.
• Mystery killer cage rule.
  Digits within a cage sums to the given expression in that cage. If there are two of them, then at least one must be true. The value of x is consistent in the whole grid.
• Thermo rule applies.
  Digits increase from bulb to end.