Sagot :
Bonjour,
a) 12x - 5 = 2x - 4
12x - 2x = -4 + 5
10x = 1
x= 1 / 10
b) 8x + 7 = 6x + 10
8x - 6x = 10 - 7
2x = 3
x= 3 / 2
c) 4x - 5 = -6x + 14
4x + 6x = 14 + 5
10x = 19
x = 19 / 10
d) 5x + 9 = 3x + 17
5x - 3x = 17 - 9
2x = 8
x= 8/2
x= 4
En espérant t'avoir aidé,
Bonsoir...
a) 12x - 5 = 2x - 4
12x + 2x = 5 + 4
14x = 9
x= 14/9
b) 8x + 7 = 6x + 10
8x - 6x = 10 + 7
2x = 17
x=17/2
c) 4x - 5 = -6x + 14
4x + 6x = 14 + 5
10x = 19
x= 19/10
d) 5x + 9 = 3x + 17
5x - 3x = 17 - 9
2x = 8
x= 8/2
:)