$\left(2x+7\right)\left(7x-1\right)$
$\int\sec\left(9x\right)dx$
$33<18-5w$
$4b+5b+12b-15b-10b=16b$
$\sqrt[9]{\frac{a^{15}c^{12}}{1258a^6}}$
$8x+8y+ax+ay$
$\frac{d^2}{dx^2}\left(x^3-3xy+y^3-1=0\right)$
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