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30x² -18xy -12y² -8x² -8xy -12y²
22x² - 26xy - 24y²
2. 3(7xy²-9x²y-11 xy) dan 5(-6x²y+3 xy²-7xy)
21xy² -27x²y -33xy + (-30x²y) + 15xy² -35xy
36xy² - 57x²y -68xy