Respuesta :
x+2[x]=261
x+2x =261
3x =261
x =261/3
x =87
comprobacion
87+2[87]=261
87+ 174=261
261 =261
x+2x =261
3x =261
x =261/3
x =87
comprobacion
87+2[87]=261
87+ 174=261
261 =261