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x + x = 4 + 8
2x = 12
x = 12/2
x = 6
Solución :
x = 6
COMPROBAMOS :
x - 8 = 4 - x
6 - 8 = 4 - 6
- 2 = - 2
La solución es correcta.
x=4-x+8
x+x=4+8
2x=12
x=12/2
x=6