Answer:
Givens
- The pair of shoes cost $58.
- He saved $32.
- He still need to save
dollars to buy them.
Basically, if you analyse the problem, you'll deduct that the sum between his saving and the dollars missing, that must be equalt to the cost of the pair of shoes. All this can be expressed as

Which we can solve for


Now, if we need to express the situation generally, it would be

Where
refers to savings,
refers to dollars missing and
refers to the cost of the pair of shoes.