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2014-05-06T19:28:59+03:00
Rd2x-rd2+1=x       rd2x-x=rd2-1   x(rd2-1)=rd2-1
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2014-05-06T19:30:18+03:00
√2(x-1)+1-x=0
√2(x-1)-(x-1)=0
(x-1)(√2-1)=0
x-1=0  √2-1=0
x=1
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