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4x - 12 - 5x - 40 = 6x + 18 - 2
4x - 5x - 12 - 40 = 6x + 18 - 2
- x - 52 = 6x + 16
- x - 6x = 12 + 52
- 7x = 68
x = 68/-7
Solución :
x = -68/7