Sagot :
Bonjour,
- 12 + 2x = - 5x + 2
5x+2x = 2 +12
7x = 14
x = 14/7 = 2
4 – (x – 3) = (x – 2) X 3 + 13
-x +3 = 3x -6 +13
3+6 -13 = 3x +x
-4 = 4x
x= -4/4 = -1
2(x – 7) – (3x + 11) = 5 – (2x – 5)
2x -14 -3x -11= 5-2x +5
2x-3x+2x = 5+5 +14 +11
x= 35
(x – 15) – (4x + 12) = (6 + 2x) – (4 – 5x)
x-15 -4x -12 = 6+2x -4 +5x
-15 -12 -6 +4 = 2x+5x -x +4x
-29 = 10x
x= -29/10 = -2,9
5x – (2x – 11) = (5 – 2x) 3 – (2x + 15)
5x -2x +11= 15 -6x -2x -15
5x+6x+2x = 15 -15 -11
13x = -11
x= -11/13