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8x - 9y - 21 - 2x + 2y - 14 = 6x - 7y - 35
bagian b
Jika 2y² - 4xy dari 3y (y-5x) = 3y² - 15xy - 2y² - 4xy = y² - 19xy
Jika 2y² + 4xy dari 3y (y-5x) = 3y² - 15xy - 2y² + 4xy= y² - 11 xy
bagian c
12p²q + 8pq - 7 - 13p² - 2pq - 12 = 12p²q - 13p² + 6pq - 19