$3x^2;\:x=2$
$\sqrt[2]{12}-3\sqrt{75}+\sqrt{27}$
$\frac { x ^ { 5 } y ^ { - 4 } } { x y ^ { - 1 } }$
$1+2\cdot5$
$\left(xy^2\right)\frac{1}{3}\left(x^5y^{-2}z-6\right)\frac{-2}{3}$
$\left(\frac{3}{4}x^2+\frac{5}{6}x-3\right)+\left(\frac{1}{2}x^2-\frac{2}{3}x+\frac{1}{2}\right)$
$3y+y'=x$
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