$\frac{2x^3+x^2-x+3}{2x+3}$
$\sqrt{a^2}$
$9f^2-6fg+g^2$
$8x^2+112+392$
$x^212x+9$
$\left(3\sqrt{5}-2\sqrt{7}\:x\right)\left(3\sqrt{5}+2\sqrt{7}\:x\right)$
$4xy-8x^2y$
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