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3x + 15 + 2x² - 6x
2x² - 3x + 15
2. 2(x + 3) - 2(3x - 4)
2x + 6 - 6x + 8
-4x + 14
3. 2(5x + 3) - 4(2x + 1)
10x + 6 - 8x - 4
2x + 2