Ktore z przekształcen zostało popranie wykonane ??
- 4x -4y+5x-6y=9x-2y
-2(x-y+ 2z-3)=-2x-y+2z-3
-(x+y)+(3x-y)-(x-3y)=3x+3y
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odp. (x+y)+(3x-y)-(x-3y)= x + y + 3x - y - x + 3y = 3x + 3y