Sagot :
Bonsoir,
A: 2 - x = x + 5 <=> 2 - x - 5 + x = x + 5 - 5 + x <=> -3 = 2x <=> x = -3/2
B: 6x + 7 = x - 13 <=> 6x + 7 - x - 7 = x - 13 - x - 7 <=> 5x = -20 <=> x = -4
Bonne soirée,
Thomas
Bonsoir
2 - x = x + 5
-x - x = 5 - 2
- 2x = 3
x = 3/-2
6x + 7 = x - 13
6x - x = - 13 - 7
5x = -20
x = -4
Bonne soirée