bonjour
( x + 1 )² - ( x - 1 )² = 0
( x + 1 + x - 1 ) ( x + 1 - x + 1 ) = 0
2 x ( 2) = 0
4 x = 0
x = 0
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bonjour
( x + 1 )² - ( x - 1 )² = 0
( x + 1 + x - 1 ) ( x + 1 - x + 1 ) = 0
2 x ( 2) = 0
4 x = 0
x = 0