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15y-25x+30-20y-24x+28-(-3y)+6x-6

Răspuns :

15y-25x+30-20y-24x+28-(-3y)+6x-6=-5y-49x+58+3y+6x-6=-2y-43x+52
15y-25x+30-20y-24x+28+3y+6x-6=-2y-43x+52