$3+4.2-4-6.7-4$
$\int2x^2\sqrt{r^2+x^2}dx$
$2x+1>9$
$\lim_{x\to-\infty}\left(e^{-x}\cdot\ln\left(1+e^x\right)\right)$
$5w+30$
$x^2-34x=73$
$x^2+9x-70$
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