-2 - 5x-1 = 10x * 2-x * 5x+1, +-1 - 4x2+2 + 8 = 9 * 2x2+2, 2 - 2x-1 * (1/3)x-1 – 2x * (1/3)x = 2/9,  (4-1) = 4x - (1/4)x ,

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