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Daca 3|8x+5y atunci 3|5x+2y

Răspuns :

3 l (8x+5y)
3 l 3=> 3 l 3(x+y)=> 3 l (3x+3y) prinzi in acolada => 3 l (8x+5y-3x-3y)=>3 l (5x+2y)