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[808-a]x2=418 cat e a?

Răspuns :

[808-a]x2=418
808-a=418:2
808-a=209
a=808-209
a=599
Co12
[808-a]x2=418
808-a=428:2
808-a=209
808-209=a
a=599
verificare: [808-599]x2=418
209x2=418
418=418 (a)