bonjour
3 x - 2 x + 1 = - 2 x + 7 x - 12
x + 2 x - 7 x = - 12 - 1
- 4 x = 11
x = - 11/4
3 x - 18 + 24 x = 9 x - 2
27 x - 9 x = - 2 + 18
16 x = 16
x = 1
4 x /3 + 2 x - 6 - 5 x /7 = 8 x /3 - 3
28 x /21 + 42 x /21 - 126/21 - 15 x /21 = 56 x /21 - 63/21
28 x + 42 x - 15 x - 56 x = - 63 + 126
- x = 63
x = - 63
3 x /2 + 4/7 - 11 x /6 = 7 /9
378 x / 252 + 63/252 - 462 x /252 = 196/252
378 x - 462 x = 196 - 63
- 84 x = 133
x = - 133/84 = - 19/12
