|f(x)| <= g(x) ⇒ -g(x) <= f(x) <= g(x)
x - 9 <= x
x - 9 >= -x
-------
x∈ R
x >= 9/2
------
x∈ [9/2, +∞)
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|f(x)| <= g(x) ⇒ -g(x) <= f(x) <= g(x)
x - 9 <= x
x - 9 >= -x
-------
x∈ R
x >= 9/2
------
x∈ [9/2, +∞)