(-1)*2=1
(1)*2=1
1-1=0
x² - 1≠0
x²≠1
x≠√1
x≠1 i x≠-1
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(-1)*2=1
(1)*2=1
1-1=0
x² - 1≠0
x²≠1
x≠√1
x≠1 i x≠-1