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- 7x + 4x + 11 - 8 = - 18
- 3x + 3 = - 18
- 3x = - 18 - 3
- 3x = - 21
x = -21/-3
x = 7
Solución :
x = 7
VERIFICAMOS :
- 7x + 11 + 4x - 8 = - 18
- 7 (7) + 11 + 4 (7) - 8 = - 18
- 49 + 11 + 28 - 8 = - 18
- 18 = - 18
Listo.