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Sa se afle x si ydin egalitatea.: xyz-x-y-z=99

Răspuns :

xyz×9-9x-9y-9z=99×9
9x×9y×9z-9x-9y-9z=891
9(x×y×z-x-y-z)=891
(..)=891:9=99
2x+2y+2z=99
6+x+y+z=99
x+y+z=93
3a=93
a=31=>x,y,z=31