$x+10=20$
$\int\frac{3x^2+2x}{x^2-4}dx$
$\lim_{x\to i}\left(\frac{1+x^6}{1+x^{14}}\right)$
$\frac{x^2-4}{x^2-2x}$
$ax+5x+2a+10$
$\frac{1}{2}x-\frac{3}{7}x$
$3a^2\cdot\left(4a^3\right)^2$
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