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Let x be the number of minutes it takes for the two machines to fill the same number of cans of soup.
Machine 1: 92 + 16x
Machine 2: 104 + 13x
Setting these two expressions equal to each other:
92 + 16x = 104 + 13x
Solving for x:
16x - 13x = 104 - 92
3x = 12
x = 4
Therefore, the two machines will have filled the same number of cans of soup after 4 minutes.