-1(x - 3) - = -x - 3, 2(x + 4) - = 2x + 8, 9(x - 3) - = 9x - 27, 3(2x +1) - = 6x +3, 9(9 - 2x) - = 81 - 18x, 6 - 2(x - 4) - = 6 - 2x + 8 = 14 - 2x, a(a - b) - b(b - a) - = a2 - ab - b2 + ab = a2 - b2,

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