Bonjour,
A) 4X+7=10
4x = 10 - 7
4x = 3
x = 3/4
B) 0,5X-2-5=7,5
0,5x = 7,5 + 2 + 5
0,5x = 14,5
x = 14,5/0,5
x = 29
C) 2x=9
x = 9/2
x = 4,5
D) 11x-2x+5=27
11x - 2x = 27 - 5
9x = 22
x = 22/9
E) 4x+1=6x+11
4x - 6x = 11 - 1
- 2x = 9
x = - 9/2
x = - 4,5.