simplify 1/2(x/2+3/2-1/2*|x-1| + 1/2(4-1/2(x-3) - 1/2*|x-3|))- 1/2*|1/2(4-1/2(x-3) - 1/2*|x-3|) -(x/2+3/2-1/2*|x-1|)|

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