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图中的九个圆圈里分别有三个17、三个19和三个21,它们分布在七条直线上,请你将这些数字移一下,使每条直线上的三个数字之和都相等。
The nine circles in the figure have three 17, three 19, and three 21, respectively. They are distributed on seven straight lines. Please move the numbers so that the sum of the three numbers in each line is the same.