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=12xy -3y² - 20x² +5xy
=-20x²-3y² +12xy +5xy
=-20x²-3y² +17xy
3y x -y = -3ykuadrat
-5x x 4x = -20xkuadrat
-5x x -y = 5xy
12xy-3y-20x+5xy
= 17xy-3y-20x