To solve the problem, we need to set up an equation based on the information given.
The shelf can hold a total of 58 cans, and since Alexei can still put 39 cans on the shelf, that means there are already some cans on the shelf. Let \( c \) represent the number of cans that are already on the shelf. The equation can be formulated as:
\[ c + 39 = 58 \]
Now, we can solve for \( c \):
- Subtract 39 from both sides of the equation:
\[ c = 58 - 39 \]
- Calculate:
\[ c = 19 \]
So, the correct equation is \( c + 39 = 58 \) and the answer is 19.
Thus, the correct response is:
c + 39 = 58 and 19