Explanation:

Sure, let's evaluate each option one by one for the given equation and determine the correct interchange of signs to make the equation correct:

- Option 1: ÷ and +

- Swapping division and addition might lead to unexpected changes in number placement, fundamentally altering the equation.

- Option 2: ÷ and -

- Switching these operations could potentially balance terms in the equation by affecting positive and negative results, but it might not solve the primary imbalance.

- Option 3: - and +

- Interchanging subtraction and addition can balance equations that involve negative and positive values to reach an intended result.

- Option 4: + and x

- Replacing addition with multiplication generally results in magnifying terms, making it unlikely to equate unless purposefully structured that way.

Your answer is option 3, where subtraction and addition are swapped.

Option 3: - and + appears appropriate to solve many equations of this kind.