$x^2+8x+81$
$\lim_{x\to1}\ln\left(3x+1\right)$
$12<x$
$-10x\left(x^2-5x+9\right)$
$\int\frac{mx+2n}{m^2x^2+4n^2}dx$
$2v-3u+5w+v+5u-7w$
$4,6s-0,4s+0,4$
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