Résous les équations suivantes du type (ax + b= cx + d):
a.7x + 1= -4-x
b. 2+3x =7-3x
c. 5+6x =-x -9
d. 5,5x +1,5= 9x + 6
a.7x + 1= -4-x
b. 2+3x =7-3x
c. 5+6x =-x -9
d. 5,5x +1,5= 9x + 6
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7x + 1 = -4 - x
7x + 1 - 1 + x = -4 - x - 1 + x
8x = -5
8x / 8 = -5/8
x = -5/8
2 + 3x = 7 - 3x
2 + 3x - 2 = 7 - 3x - 2
3x + 3x = 5 - 3x + 3x
6x /6 = 5 /6
x = 5/6
5 + 6x = - x - 9
5 + 6x - 5 = -x - 9 - 5
6x + x = - x - 14 + x
7x = -14
7x/7 = -14/7
x = -2
5,5x + 1,5 = 9x + 6
5,5x + 1,5 - 1,5 = 9x + 6 - 1,5
5,5x = 9x + 4,5
5,5x - 9x = 9x + 4,5 - 9x
- 3,5x / -3,5 = 4,5 / -3,5
x = 4,5/-3,5