bonjour
2 x = - 2 x + 8
2 x + 2 x = 8
4 x = 8
x = 2
4 x - 8 = 7 x + 4
4 x - 7 x = 4 + 8
- 3 x = 12
x = - 4
3 x + 5 = 6 x - 9
3 x - 6 x = - 9 - 5
- 3 x = - 14
x = 14/3
( x - 10 )² - x² = - 340
x² - 20 x + 100 - x² = - 340
- 20 x = - 340 - 100
- 20 x = - 440
x = 22
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bonjour
2 x = - 2 x + 8
2 x + 2 x = 8
4 x = 8
x = 2
4 x - 8 = 7 x + 4
4 x - 7 x = 4 + 8
- 3 x = 12
x = - 4
3 x + 5 = 6 x - 9
3 x - 6 x = - 9 - 5
- 3 x = - 14
x = 14/3
( x - 10 )² - x² = - 340
x² - 20 x + 100 - x² = - 340
- 20 x = - 340 - 100
- 20 x = - 440
x = 22