$\left(xy-7\right)^3$
$2x+9x^2$
$\lim_{x\to\infty}\left(\frac{1+x^2}{e^{2x}}\right)$
$\frac{2x+1}{9}+\frac{x-3}{4}>\frac{1}{2}$
$2x+y-5-5x-2y+1$
$a^3+a+a^3+a$
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