$3x+9x^2-x+5x^2+4x$
$\left(a^2+2ab^2\right)\left(3a-7b\right)$
$\lim_{x\to0}\left(\frac{3x+tan\left(2x\right)}{5x-tan\left(3x\right)}\right)$
$2\sqrt{100}$
$\frac{18}{3}-1$
$49x^2-98x+1$
$\left(4m-14\right)^2$
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