bonsoir
0 = - 6 - 4 x
4 x = - 6
x = - 6/4 = - 3/2
4 x- 3 = 2 x + 9
4 x - 2 x = 9 + 3
2 x = 12
x = 6
7 + 6 - 2 x = 4 x - 1
- 2 x - 4 x = - 1 - 7 - 6
- 6 x = - 12
x = 2
x² - 2 = x² + 3 x - x - 3
x²- x² - 3 x + x = - 3 + 2
- 2 x = - 1
x = 1/2
n + n + 1 + n + 2 + n + 3 = 450
4 n = 450 - 6
4 n = 444
n = 111
111 + 112 + 113 + 114 = 450
