To simplify \( 37x + 27x \), you can combine the like terms:
\[ 37x + 27x = (37 + 27)x = 64x \]
However, since \( 64x \) is not listed among your options, let's look more carefully at your choices. The provided options seem to not include the simplified result. Nevertheless, you can find that \( 64x \) is the correct simplified form of \( 37x + 27x \).
If you're looking for a different numerical expression or misinterpretation, please clarify the context or check the options again.