Choice Bhoice D is the correct answer. We subtract the constant to isolate the variable.

1. Start with the equation: $x + 7 = 22$
2. Subtract 7 from both sides: $x = 22 - 7$
3. Calculate: $x = 15$
4. Verify: $15 + 7 = 22$ ✓

This problem reinforces the standard pattern for solving one-step addition equations.

Choice Bhoice D is incorrect because this results from adding instead of subtracting: $22 + 7 = 29$. This is the opposite of what we need.

Choice Bhoice C is incorrect because this confuses the constant (7) with the solution. Just because 7 appears in the equation doesn't mean $x = 7$.

Choice Bhoice C is incorrect because this results from dividing: $\frac{22}{7} \approx 3.14$ (which happens to be close to $\pi$). Division is not relevant for this equation.