Answers

2016-06-22T09:35:58+08:00
(2x-1)^2=(x+1)^2
4x2-2x+1=x2+x+2
    4x2+x2=5x4
    -2x=x=-x
    1+2=3
=5x4-x+3 just understand it . okaay 
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