$2x^2-4x-6$
$\lim_{x\to2}\left(\frac{2-x}{\sqrt{4-x^2}}\right)$
$2+12+36$
$-3+5-8+9-\left(-3\right)$
$9w^2+24w+16$
$3\left(2-x\right)<7$
$\log_a\left(x\right)-\log_a\left(3\right)=\frac{1}{2}\log_a\left(16\right)$
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