$80x^5-5x$
$\lim_{x\to0}\left(13x+7\right)$
$x^2-20x+181$
$3^3.3^4$
$\left(3y-8\right)\left(y+3\right)$
$2^3:2^2$
$7a^2b-5ab^2;\:a=3;\:b=5$
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