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2. 5( - 4y^2 - 12y + 8) = - 20y^2 - 60y + 40
3. 12 + 2(4x - 3) = 12 + 8x -6 = 8x + 6 = 2 ( 4x + 3)
4. 5 (a - 3b) + 18a = 5a - 15b + 18a = 23a - 15b
5. 8( 3x + 4y) - 5(4x - 6y) = 24x + 32y - 20x + 30y = 4x + 62y = 2 ( 2x + 31y)