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2. 12 + 2 (4x - 3) = 12 + 8x - 6 = 6 + 8x
3. 8(3x - 4y) - 5(4x - 6y) = 24x - 32y - 20x + 30y = 4x - 2y
4. a(a + 3b) + 2a(4a + 5b) = a^2 + 3ab + 8a^2 + 10ab = 9a^2 + 13ab
5. 5x(4x - 3y) - 3x(5x + 2y) = 20x^2 - 15xy -15x^2 - 6xy = 5x^2 - 21xy
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