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=3a+4a-6+20
= 7a+14
3a - 6 + 4a + 20
3a + 4a - 6 + 20
7a + 14
b. 5 (4x² + 3x - 5) - (4x² - 3x)
20x² + 15x - 25 - 4x² + 3x
20x² - 4x² + 15x + 3x - 25
16x² + 18x - 25