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9a + 12 - 17a - 14
9a - 17a + 12 - 14
-8a - 2
b. 11x² - 17x + 24 -(2x² + 15x - 18)
11x² - 17x + 24 -2x² - 15x + 18
11x² - 2x² - 17x - 15x + 24 + 18
9x² - 32x + 42
c. 28y² + 24y - 20 -(-20y² + 10y - 40)
28y² + 24y -20 + 20y² - 10y + 40
28y² + 20y² + 24y - 10y -20 + 40
8y² + 14 + 20