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3x - 8x - 5x = 3 - 18 + 5
- 10x = - 10
x = -10/-10
x = 1
Solución :
x = 1
3x - 8x - 5 = 5x -15
-5x - 5 = 5x -15
15-5= 5x + 5x
10 = 10x
10/10 = x
1 = x