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Let g(x)=2f(x/2)+f(2-x) and f''(x) < 0...

Let `g(x)=2f(x/2)+f(2-x) and f''(x) < 0 AA x in (0,2).` If `g(x)` increases in `(a, b)` and decreases in `(c, d),` then the value of `a + b+c+d-2/3` is

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