bonjour
2 ( x + 4 ) - 3 ( 4 - x ) = 0
2 x + 8 - 12 + 3 x = 0
5 x = - 8 + 12
5 x = 4
x = 4/5
2 x² + 2 x - x - 1 + 3 x - 2 x² - 12 + 8 x = 5
12 x = 5 + 1 + 12
12 x = 18
x = 18/12 = 3/2
( x + 1 )² = ( x - 1 )²
( x + 1 )² - ( x - 1 )² = 0
x² - 1 = 0
x ² = 1
x = √ 1 ou - √ 1
