Hi,

x = 

5(2y+5)-10y=25

 10y + 25 -10y = 25

           0 = 0  There are infinite solutions for this system.  

 x = 2y + 5  and 5x-10y = 25 are the same line:

Note:  x = 2y + 5, 5x = 10y + 25   and 5x-10y = 25 

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