$6a+18b$
$\lim_{x\to9}\left(\frac{3-\sqrt{x+2}}{x-7}\right)$
$z^2-18z$
$\left(3x\right)^2\left(x\right)$
$4\sqrt{10x^7+6x^5}$
$9v^2-12v+4$
$2x^3+3x^2-18x+8$
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