$\int\frac{20}{x}dx$
$\int\left(x^2+x\right)^7\left(2x+1\right)dx$
$x^2-18x+17$
$\left(x-3\left(x+3\right)\right)$
$3x+3x^2$
$\lim_{x\to\infty}\left(\frac{\sqrt{1+16\cdot x^6}}{2-x^3}\right)$
$100ax^2+44a^2x$
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