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kalau disederhanakan
125x2-25x2-25x2y+5xy2+5xy2-y2
100x2-20x2y+5xy2-y2
2.12x2-21x2y+12xy2+8x2y-12xy2+8y2
kalau disederhanakan
12x2-21x2y+8x2y+12xy2-12xy2p+8y2
12x2-13x2y+8y2