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-13x-15y+9x-19x-3y+12x+7x= as dori rezolvarea


Răspuns :

-4x-18y  este rezolvarea
-13x-15y+9x-19x-3y+12x+7x=
-13x+9x-19x+12x+7x-15y-3y=
-4x-18y=-2(2x+9y)