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x + 12 = - 23
x = - 23 - 12
x = - 35
Respuesta.
x = - 35
Comprobación.
x + 12 = - 23
- 35 + 12 = - 23
-23 = - 23
Pasas el número 12 a restar:
x = - 23 - 12
x = - 35
Gracias :D