1. The problem is to simplify the expression $\text{Ex-ex}$. 2. Since $\text{Ex}$ and $\text{ex}$ are variables or terms, and subtraction is involved, we treat them as algebraic terms. 3. The expression $\text{Ex-ex}$ can be factored by taking out the common factor $e x$ if $E$ and $e$ are constants or variables. 4. Rewrite as $E x - e x = (E - e) x$. 5. This is the simplified form of the expression. Final answer: $$(E - e) x$$