bonjour
3 x + 7 = - 9 + 2 x + 1
3 x + 7 = 2 x - 8
3 x - 2 x = - 8 - 7
x = - 15 donc n'admet pas - 1 comme solution
x + 4 + 7 x = 5 x - 2 + 2 x + 1
8 x + 4 = 7 x - 1
8 x - 7 x = - 1 - 4
x = - 5 donc n'admet pas - 1 comme solution
Bonjour,
3x+7 = -9 +2x +1
3x-2x = -9 +1 -7
x = -15
3x
3*-1 +7 = -9 +2*-1 +1
4 ≠ -7
Donc, non
x+4 +7x = 5x -2 +2x +1
x+7x -5x -2x = -2+1-4
x = -5
Donc non.
-1+4 +7*-1 = 5*-1 -2 +2*-1 +1
-1+4 -7 = -5 -2 -2* +1
-4 ≠ -8
