$\left(7a^2-9a+1\right)\left(a-2\right)$
$y-3=-10$
$-3x^2+4x-3\ge0$
$\int\:\frac{x}{\sqrt{x-1}}dx$
$25^2^a\:-|2|^2^b$
$4\:\cot x+5=9$
$\frac{d}{dx}5x^2-3y+y^2-3x^4-4+4x^2y$
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