1. **Problem:** If $x + 2 = 4$, what is the value of $x$? 2. **Formula used:** To isolate $x$, subtract the same number from both sides of the equation. 3. **Solve step by step:** $$x + 2 = 4$$ $$x + 2 - 2 = 4 - 2$$ $$x + \cancel{2} - \cancel{2} = 4 - 2$$ $$x = 2$$ 4. **Check the answer:** Substitute $x = 2$ back into the equation. $$2 + 2 = 4$$ This is true, so the answer is correct. 5. **Final answer:** $x = 2$