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Daca 2x+2y+y27,iar x+y = 12 aflati x si y pls dau coroana

Răspuns :

2x+2y+y=27

2(x+y)+y=27

x+y=12

2*12+y=27

24+y=27

y=27-24

y=3

x+3=12

x=12-3

x=9