Question: labels on equations changed by dragging an equation

Hello people in mapleprimes,


I have a question of labels of equations.

For example, suppose that there is a following description in a worksheet.


  2*x+y=5   (1)


  3*x+y=6   (2)


 {x=1,y=3}          (3)




And, when I moved (2) to the next to (1) with dragging, and then, clicked !!! to execute it, then the worksheet 

changes as follows, which is wrong as accompanying ??



 3*x+y=6   (1)


{x = x, y = -3*x+6}          (2)




Do you know some good way for ?? not to appear in the above sitiation.

I will appreciate when you tell me some measures about this.


Best wishes.









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