1. **Problem:** Determine who is correct in solving the equation $2x + 9 = 3$ between Dexter and Aisha. 2. **Equation:** $2x + 9 = 3$ 3. **Step 1:** Subtract 9 from both sides to isolate the term with $x$: $$2x + 9 - 9 = 3 - 9$$ $$2x = -6$$ 4. **Step 2:** Divide both sides by 2 to solve for $x$: $$x = \frac{-6}{2}$$ $$x = -3$$ 5. Dexter's mistake is in the sign of the solution; he wrote $x=3$ instead of $x=-3$. 6. **Final answer:** Aisha is correct; $x = -3$.