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Meilleure réponse !
  • Utilisateur Brainly
2014-06-01T13:06:31+02:00
10x + 5 = 5(x - 3)
10x + 5 = 5x - 15
10x - 5x = - 15 - 5
5x = - 20
x = -20/5
x = - 4

S= {- 4}
2014-06-01T13:09:18+02:00
10x + 5 = 5(x-3)
10x + 5 = 5×x - 5×3
10x + 5 = 5x-15
10x + 5 -5 = 5x - 15 - 5
10x = 5x -20
10x - 5x = 5x - 20 -5x
 \frac{5x}{5}  =  \frac{-20}{5}
x = -4