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3x + 12 -6 < 5x -5 + x
3x -5x -x < -5 -12 +6
-3x < -11 (Multiplicar por -1 para que sea positivo)
3x > 11
x > 11/3
3x + 12 - 6 < 5x - 5 + x
3x + 6 < 6x - 5
3x - 6x < - 5 - 6
- 3x < - 11
x> -11/-3
x> 11/3
Solución : ]11/3; +∞[