$9=5-x$
$2xdx+dy=0$
$\left(+18\right):\left(-3\right).\left(+8\right)$
$\frac{0.44}{0.04}$
$\left(3x+1\right)\left(x^2-2x+1\right)$
$\lim_{x\to1}\left(2x^2+x+4\right)$
$\sqrt{ax^2}$
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