$34+4$
$9pw-9w+16f-16pf$
$9x^4+144$
$\lim_{x\to2}\left(\frac{2x}{\sqrt{3x-1}}\right)$
$x+3\ge7$
$\left(2-s^3\right)\left(2+s^3\right)$
$36x^2-72x+81=0$
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