42 9 2=10

The provided mathematical expression '42 9 2=10' is ambiguous due to the missing operators. If the intention was 42 / (9 + 2), it would be 42 / 11, which is not 10. If it was meant to be something like (42 + ?) / ?, or another combination, further clarification is needed. Assuming a division context, if it were 42 / X = 10, then X would be 4.2. If it were 42 - X = 10, X would be 32. Without clear operators, a definitive answer cannot be provided.