$y ^ { \prime } \cdot 3 y - 28 y = y$
$\int\frac{1}{36-x^2}dx$
$\left(12ab-15cd\right)-\left(11ab-15cd\right)$
$\lim_{x\to2}\left(\frac{x^3+2x^2}{x^2-4}\right)$
$\left(x+a^2\right)\left(x-a^2c\right)$
$4x-3y+2-2x+5z-6$
$\left(6m^4+8n^3\right)^2$
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