1. **State the problem:** Simplify the expression $ (x+3-3)^2 $. 2. **Understand the expression:** Inside the parentheses, we have $ x + 3 - 3 $. According to the order of operations, addition and subtraction are performed from left to right. 3. **Simplify inside the parentheses:** $$ x + 3 - 3 = x + \cancel{3} - \cancel{3} $$ The $+3$ and $-3$ cancel each other out, leaving just $x$. 4. **Rewrite the expression:** $$ (x)^2 $$ 5. **Square the simplified term:** $$ x^2 $$ **Final answer:** $$ x^2 $$