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PART A: The equation that can be used to find the cost of each pair of socks is:
26 + 3x = 47
PART B: To find the cost of each pair of socks, we subtract the cost of the shirt from the total amount spent and then divide by the number of pairs of socks bought.
47 - 26 = 21
21 / 3 = 7
Therefore, each pair of socks costs $7.