9a + 12 - (7a + 14) = (9a-7a) + (12-14) = 2a + (-2) = 2a - 2
11x"-17x+24 - (2x"+15x-18 ) = 9x" - 32x + 42
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9a + 12 - (7a + 14) = (9a-7a) + (12-14) = 2a + (-2) = 2a - 2
11x"-17x+24 - (2x"+15x-18 ) = 9x" - 32x + 42