$\lim_{x\to11}\left(\frac{121-x^2}{11x-x^2}\right)$
$3m\left(5m^2-3m\right)$
$\left(-5a-2b^2\right)^3$
$3x-5;\:x=7;\:x=4$
$5x+4y\:-2x\:-2y$
$v^2dx+xdv=0$
$\int_{-1}^3-4xdx$
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