$5x^2+20x+3$
$\frac{3n^2}{2n}$
$49a^{2}b^{8}-c^{4}$
$\int3\sec^2\left(2t\right)dt$
$48x+x-49x$
$-30a^2+25a^4+9a^4$
$4c^2+88c+121$
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