Réponse:
- 4 (y + 3) = 7y
- 4y - 12 = 7y
- 12 = 7y + 4y
- 12 = 11y
=> 11y = - 12
11y + 9 + 6 (7 - y) = 3
11y + 9 + 42 - 6y = 3
11y - 6y + 9 + 42 = 3
5y + 51 = 3
5y = 3 - 51
5y = - 48
=> 5y + 48 = 0
2y² - 2y (y - 8) = 13
2y² - 2y² + 16y = 13
0 + 16y = 13
=> 16y = 13
y² + 2y + 1 + 3y(6y + 1) = 19y²
y² + 2y + 1 + 18y² + 3y = 19y²
y² + 18y² + 2y + 3y + 1 = 19y²
19y² + 5y + 1 = 19y²
5y + 1 = 19y² - 19y²
=> 5y + 1 = 0
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