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8-15=2x+1x
-6=3x
-6/3=x
2x - 3x + 8 = 4x - 2x + 15
- x + 8 = 2x + 15
- x - 2x = 15 - 8
- 3x = 7
x = -7/3
Solución :
x = -7/3