bonjour
4 x + 8 = x - 1
4 x - x = - 1 - 8
3 x = - 9
x= - 3
5 y + 1 = 3 y - 3 - 2
5 y - 3 y = - 5 - 1
2 y = - 6
y = - 3
3 n - 1 = 2n + 2
3 n - 2 n = 2 + 3
n = 5
4 a + 4 - 5 = 6 a + 5
4 a - 6 a = 5 - 4 + 5
- 2 a = 6
a = - 3
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bonjour
4 x + 8 = x - 1
4 x - x = - 1 - 8
3 x = - 9
x= - 3
5 y + 1 = 3 y - 3 - 2
5 y - 3 y = - 5 - 1
2 y = - 6
y = - 3
3 n - 1 = 2n + 2
3 n - 2 n = 2 + 3
n = 5
4 a + 4 - 5 = 6 a + 5
4 a - 6 a = 5 - 4 + 5
- 2 a = 6
a = - 3