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Who knows all answers to this if you know what this is

Who knows all answers to this if you know what this is-example-1
User Aacanakin
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The line on the left with the arrow at the end.
One end is filled in meaning
\leq
and there is an arrow showing it goes on forever

The line is behind -2 and all numbers in it are
\leq 2
User Diogo Santos
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