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2. 6a-3b+3a+5b = 6a + 3a - 3b + 5b = 9a + 2b
3. 4(3x-5y)-5(x+3y) = 12x - 20y - 5x - 15y = 12x - 5x - 20y - 15y = 7x - 35y
4. 4x²+3x - 2(5x-x²) = 4x² + 3x - 10x - 2x² = 4x² - 2x² + 3x - 10x = 2x² - 7x
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