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3x + 18 - 6x - 4 = - x + 7
3x - 6x + 18 - 4 = - x + 7
- 3x + 14 = - x + 7
- 3x + x = 7 - 14
- 2x = - 7
x = -7/-2
x = 7/2
Solución :
x = 7/2
3x + 12 - 6x -4 = -x + 7
-3x + 8 = -x + 7
3x - x= -8 + 7
2x= -1
x= -1/2
X= -0.5