Choice Choice C is the correct answer. This multiplication equation requires division to isolate the variable.

1. Start with the equation: $7x = 42$
2. Divide both sides by 7: $x = \frac{42}{7}$
3. Simplify: $x = 6$
4. Verify: $7(6) = 42$ ✓

💡 Mental Math Tip: Knowing your multiplication tables helps! Since $7 \times 6 = 42$, we can quickly identify that $x = 6$.

Choice Choice D is incorrect because this results from subtracting 7 from 42: $42 - 7 = 35$. Subtraction is not the inverse of multiplication.

Choice Choice B is incorrect because this comes from adding: $42 + 7 = 49$. Addition doesn't undo multiplication either.

Choice Choice A is incorrect because this results from multiplying: $42 \times 7 = 294$. This compounds the multiplication instead of reversing it.