$4x^2-20x$
$15x^2+36x+12$
$3\left(5a-3\right)+6a$
$49a+14a+1$
$\int x^2\cdot e^{-13x}dx$
$\left(2t-3\right)^2$
$\lim\:_{x\to\:2}\left(\frac{4}{3}\right)^{\frac{-3}{x^2-4x+4}}$
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