bonsoir
( 2 x + 3 )² = ( 4 x + 5 )²
( 2 x + 3 )² - ( 4 x + 5 )² = 0
( 2 x + 3 + 4 x + 5 ) ( 2 x + 3 - 4 x - 5 ) = 0
( 6 x + 8 ) ( - 2 x - 2 ) = 0
x = - 8/6 = - 4/3
ou x = - 1
