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The s____ between the two reports suggests that one person wrote both.
已知函数f(x)=|x+2|﹣2|x﹣1|.
(Ⅰ)求不等式f(x)≥﹣2的解集M;
(Ⅱ)对任意x∈a,+∞,都有f(x)≤x﹣a成立,求实数a的取值范围.