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=> (15a³ + 20a² - 45a) - (45a³ + 10a² - 45a + 63)
=> 15a³ - 45a³ + 20a² - 10a² - 45a + 45a - 63
=> -30a³ + 10a² - 63
b. 4(a²b + ab² - 7) dari 4a(ab - 3b² - 9)
=> (4a²b + 4ab² - 28) - (4a²b - 12ab² - 36a)
=> 4a²b - 4a²b + 4ab² + 12ab² + 36a - 28
=> 16a²b + 36a - 28
=> 4(4a²b + 9a - 7)