Sagot :
Bonjour,
5x+12= -2x-23
5x + 2x = - 23 - 12
7x = - 35
x = - 35/7
x = -5= 5
(3x-4)(2x+1)= 6(x2+x+2)- (5+x)
6x² + 3x - 8x - 4 = 6x² + 6x + 12 - 5 - x
6x² - 6x² + 3x - 8x - 6x + x = 12 - 5 + 4
- 10x = 11
x = - 11/10.
bonjour
5 x + 12 = - 2 x - 23
5 x + 2 x = - 23 - 12
7 x = - 35
x = - 5
( 3 x - 4 ) ( 2 x + 1 ) = 6 ( x² + x + 2 ) - ( 5 + x )
6 x² + 3 x - 8 x - 4 = 6 x² + 6 x + 12 - 5 - x
6 x² - 5 x - 4 = 6 x² + 5 x + 7
6 x² - 6 x² - 5 x - 5 x = 7 + 4
- 10 x = 11
x = - 11 /10