$\frac{x^2-3x}{x}$
$18-2x>4$
$\lim_{x\to\infty}\left(\sqrt{\left(2x^2+1\right)}-2x\right)$
$\left(\frac{1}{2}x+3y\right)^3$
$\left(a^2+ax+x^2\right)\left(a^2-ax+x^2\right)$
$\left(x+4\right)\left(x-1\right)\left(x+3\right)\left(x+8\right)-3$
$4x^2-7x^2-2x^2+6x^2-8x^2+3x^2$
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