$8m+14-124n$
$5x+2+6x-8-x+3+9x$
$\left(xy^3+2x\right)^5$
$\frac{d}{dx}\left(x^3y-x^2=y^2\right)$
$\lim_{x\to1}\left(\sqrt{x}-1\right)$
$- \frac { 9 x } { 3 x ^ { 2 } }$
$169x^2-121y^2$
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