$4x+4\le9x+8$
$\frac{d}{dx}13^x$
$6-x\ge2x+9$
$\int\left(\frac{1}{x-9}\right)dx$
$\lim_{x\to0}\left(x^3-x^2+2x+1\right)$
$\left(2^5\right)^4$
$7x^4-5x^4$
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