Welcome to the (harder) random linear inequality machine!
Solve: −1 ≤ −2(−x − 1) < 0
Note: due to the limitations of computer keyboards, you likely don't have an ∞ key, so just write “inf” or the like; if you write anything that I can't parse as a number then I'll assume you mean ±∞.
Also, if you only want to write 1 interval, just write it in the first spot and leave the other blank.
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