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z=2
La comprobacion la haces reemplazando el 2 por el z.
2z + 3 = 5 + z
2z - z = 5 - 3
z = 2
Solución :
z = 2
COMPROBAMOS :
2z + 3 = 1 + z + 4
2 (2) + 3 = 1 + 2 + 4
4 + 3 = 7
7 = 7
La solución es correcta.