Bonjour
a = ( 6 x + 5 ) ( 7 + 2 x ) + ( - 2 - 7 x ) ( 5 + 6 x )
a = ( 6 x + 5 ) ( 7 + 2 x - 2 - 7 x )
a = ( 6 x + 5 ) ( - 5 x + 5 )
a = - 30 x² + 30 x- 25 x + 25
a = - 30 x² + 5 x + 25
- 30 x² + 5 x + 25 = 25
- 30 x² + 5 x = 0
5 x ( - 6 x + 1 ) = 0
x = 0 ou - 1 /6
- x ( 2 x + 5 ) ( - 5 + x ) = 0
x = 0 ou - 5/2 ou 5
( y - 2 ) ( - 2 y + 3 ) = 0
y = 2 ou 3/2