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kalo dari berarti dikurang, jadi :
-20y^2 +10y +40
28y^2 + 24y - 20
-48y^2 - 14y + 60
= ( 28y^2 + 24y -20) - (-20y^2 + 10y - 40)
= 28y^2 + 24y - 20 + 20y^2 - 10y + 40
= 48y^2 - 14y + 20