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2\le x<5
\left\lbrack2,5\right)
x>-\frac73
\left(-\frac73,\infty\right)
x\le3.2
\left(-\infty,3.2\rbrack\right.
Interval notation
compactly compresses inequalities
[ and ]
Include endpoints
( and )
exclude endpoints
\infty and -\infty
Always use parentheses