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Meilleure réponse !
  • Utilisateur Brainly
2014-09-07T16:00:52+02:00
3x - 5 = 12
3x = 12 + 5
3x = 17
x  17/3

2x - 3 = 4x + 1
- 3 - 1 = 4x - 2x
- 4 = 2x
- 4/2 = x
- 2 = x

3(z - 1) = 2
3z - 3 = 2
3z = 2 + 3
3z = 5
z = 5/3

6/t = 2
6 = 2t
3 = t

x/3 = 7
x = 7 * 3
x = 21