Given that the solution of the fractional equation a + 2x + 1 = 1 about X is a non positive number, then the value range of a is______ ．

The solution is: x = a + 1, ∵ x ≤ 0, x + 1 ≠ 0, ∵ a + 1 ≤ 0, X ≠ - 1, ∵ a ≤ - 1, a + 1 ≠ - 1, ∵ a ≠ - 2, ∵ a ≤ - 1 and a ≠ - 2

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