Réponses

2014-02-10T21:02:25+01:00
6 - x = 5 - 4x
-x + 4x = -6 + 5
3x = -1
x = - 1/3

8y - 7 = - 12y + 2
8y + 12y = +7 + 2
20 y = +9 
y = 9/20

5(2x - 1) = 2 -(x - 3)
10x - 5 = 2 - x + 3
10x + x = +5 + 2 + 3
11 x = 10
x = 10/11

5 -2(x + 3) = 3 - x
5 -2x -6= 3 - x
5 - 6 - 3 = + 2x - x
- 4 = 1x
-4 = x

8(x - 2) = 4(2x - 4) - 3x
8x - 16 = 8x -16 -3x
8x -8x +3x = +16 -16
3x = 0
x = 0/3
x = 0

3(-x +7) = -7(x + 3)
-3x + 21 = -7x -21
21 + 21 = +3x -7x
42 = -4x
+4x = -42
x = -42/4
x = -21/2