To simplify the expression \(3x - x - 2x\), we can combine the like terms:
- Combine the \(x\) terms: \[ 3x - x - 2x = (3 - 1 - 2)x = 0x \]
Since \(0x\) equals \(0\), the expression simplifies to:
\[ 0 \]
Therefore, in lowest terms, the expression \(3x - x - 2x\) is simply \(0\).