[tex]a) \: \frac{1}{3} (9a - 12b + 6) = \frac{9a}{3} - \frac{12b}{3} + \frac{6}{3} = 3a - 4b + 2 \\ b) \: \frac{5x - 10y + 25}{5} = \frac{5x}{5} - \frac{10y}{5} + \frac{25}{5} = x - 2y + 5 \\ c) \: 2x + 4 - \frac{12x - 20}{4} = 2x + 4 - \frac{12x}{4} + \frac{20}{4} = 2x + 4 - 3x + 5 = 9 - x [/tex]
