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Ejemplo:
x + 8 + (-5) = 4 + (-2)
x + 8 -5 = 4 - 2
x + 3 = 2
x = 2 - 3
x = -1 =>respuesta
Verificamos:
x + 8 + (-5) = 4 + (-2)
-1 + 8 -5 = 4 - 2
8 -6 = 2
2 = 2
Igualdad Verdadera
Espero ayude