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Efectuati :7x-[5y(3x-2y-5)]+7-10x+9y =

Răspuns :

7x-[5y-(3x-2y-5)]+7-10x+9y=
 7x-(5y-3x-2y-5)+7-10x+9y=
 7x-3y-3x-5+7-10x+9y=-
6x+12y+2