Let f(x)f(x)f(x) be a differentiable function such that f(x)+xf(x)3=1+xf(x) + xf(x)^3 = 1 + xf(x)+xf(x)3=1+x. If f(1)=1f(1) = 1f(1)=1, what is the value of f′(1)f'(1)f′(1)?
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