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Meilleure réponse !
  • Utilisateur Brainly
2014-09-06T18:26:39+02:00
5x - 7x² = 0
- 7x² + 5x = 0
7x² - 5x = 0
x(7x - 5) = 0
x = 0

ou 

7x - 5 = 0
7x = 5
x = 5/7

S= {0 ; 5/7}