$-3xy^2+21xy^3+15xy^4$
$\left(\sqrt{7}+4\right)\left(\sqrt{7}-4\right)$
$123.2-82.0$
$\lim_{x\to\sqrt{2}}\left(\frac{x^2-\sqrt{2}x+\sqrt{5}x-\sqrt{10}}{x-\sqrt{2}}\right)$
$\int\ln\left(7z-8\right)dz$
$x+3\ge5$
$\left(7y^9\right)\left(3y^3\right)\left(6y^6\right)$
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