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Find at which step of the following proof, it becomes false.   And give the reason.
  1. x  =  y
  2. x + x  =  x + y
  3. 2 x  =  x +  y
  4. 2 x – 2 y  =  x  +   y  –  2 y
  5. 2 x – 2 y  =  x  –  y
  6. 2 ( x – y )  =  x  –  y
  7. 2 = 1
  

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