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The thinking training book for the fourth grade of Qizhi Mathematics, how to do this problem?
T-shirts are x yuan each and shorts are y yuan each.

From the meaning of the question, 3x = 5y, y = 39.

Substitute y = 39 into 3x = 5y to get 3x = 5 * 39.

3x = 195

x = 65

Every T-shirt, 65 yuan.