bonjour
a) 4 x + 7 = - 6 x - 4 - 2 x
4 x + 6 x + 2 x = - 4 - 7
12 x = - 11
x = - 11/12
b) 20 x - 10 - 6 x = 6 - 5 x
20 x - 6 x + 5 x = 6 + 10
19 x = 16
x = 16/19
c) 9 x /7 = - 21/4
36 x = - 147
x = - 147/36 = - 49/ 12
d) 4 x - 8 x + 2 = - 7 - 6 x + 12
- 4 x + 6 x = - 7 + 12 - 2
2 x = - 2
x = - 2/2 = - 1
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bonjour
a) 4 x + 7 = - 6 x - 4 - 2 x
4 x + 6 x + 2 x = - 4 - 7
12 x = - 11
x = - 11/12
b) 20 x - 10 - 6 x = 6 - 5 x
20 x - 6 x + 5 x = 6 + 10
19 x = 16
x = 16/19
c) 9 x /7 = - 21/4
36 x = - 147
x = - 147/36 = - 49/ 12
d) 4 x - 8 x + 2 = - 7 - 6 x + 12
- 4 x + 6 x = - 7 + 12 - 2
2 x = - 2
x = - 2/2 = - 1