28x - 12 - 4(7x -3), 28 + 56x - 7(4 + 8x), -12x - 42 - -6(2x + 7), 12x + 42 - 6(2x + 7), 20 + 32x - 4(5 + 8x ), 20 - 32x - 4(5 - 8x), 40x + 80 - 10(4x + 8), -40x - 80 - -10(4x + 8), 30 + 12x - 2(15 + 6x), -30 + 12x - 2(-15 + 6x), -30 - 12x - -2(15 + 6x), 21 + 6x - 3(7 + 2x), 12x - 48 - 12(x - 4), 12x + 48 - 12(x + 4), 50x + 20 - 10(5x + 2) , 50 + 10x  - 10(5 + x) ,

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