1. **State the problem:** Simplify the expression $x - 4x$.
2. **Recall the rule:** When subtracting like terms, subtract their coefficients.
3. **Apply the rule:**
$$x - 4x = 1x - 4x = (1 - 4)x = -3x$$
4. **Final answer:** The simplified expression is $-3x$.
Simplify Expression 05D5C0
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