Sagot :
a. 5x+1 = 2x -7
5x = 2x-8
3x= - 8
x = 8/3
b. A= (3x-2) (6x+5)
A = 18 x² + 15x -12x -10
A= 18 x² +3x -10
B= 3(2x+4)
B = 6x +12
C = 5-(2x-3)
C = 5-2x +3
C= 8-2x
5x = 2x-8
3x= - 8
x = 8/3
b. A= (3x-2) (6x+5)
A = 18 x² + 15x -12x -10
A= 18 x² +3x -10
B= 3(2x+4)
B = 6x +12
C = 5-(2x-3)
C = 5-2x +3
C= 8-2x