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18x+15y+24 daca6x+5y=90


Răspuns :

18x+15y+24 =3*6x+3*5y+24=3(6x+5y)+24=3x90+24=270+24=294
18x+15y+24=3*6x+3*5y+24=3*90+24=270+24=294