$\frac{12x}{6x^2}$
$x^3-x^2-9x-6$
$\left(9u-2x\right).\left(9u+2x\right)$
$r3\:+\:729$
$2.300\:+\:4.100\:$
$n+6<28$
$\left(\frac{1}{2}+\sqrt{a}\right)^4$
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