Maths History Collapsed !!!!!!!!!!

Prove 1=2
Lets Assume
=> x=y
=>2x-x=2y-y
=>2x-2y=x-y
=>2(x-y)=x-y
=> 2=1
=> 1=2
Hence Proved
Huurrraaaa.....
Dekha maths ka itihaas hila kar rakh diya