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2. -2x+y+7z
3. 6x kuadrat - 12x + 15 + 8x kuadrat + 6x -14 = 14x kuadrat - 6x + 1
2. -2x+y+7z
3. 6x kuadrat - 12x + 15 + 8x kuadrat + 6x -14 = 14x kuadrat - 6x + 1