$2x+4y-7y+1$
$\int\frac{x}{\sqrt{\left(x^2+4\right)^5}}dx$
$9a^2b^2+30a^2bc+25a^2c^2$
$\sqrt{144}\cdot\left(-2\right)+3\left|-1-\left(-4^3\right)-64\right|-\left(-7^2\right)$
$\frac{x^2-3x-7}{x-5}$
$715m^2x+m^2x$
$\sqrt{3\sqrt{9}}$
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