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fff is a function from the reals to the reals, satisfying x+f(x)=f(f(x)) x + f(x) = f( f(x) ) x+f(x)=f(f(x)). In the interval [−10,10] [-10, 10] [−10,10], how many solutions are there to f(x)=0 f(x) = 0f(x)=0?
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