$x-3=-3$
$\frac{z^3+1}{z^2-1}$
$\frac{1}{x}+\frac{x^3+x^2}{x^3}$
$-8-+4$
$7n^2+n^4+10$
$\left(xe^{y^2}-1\right)dx+x^2ye^{y^2}dy=0$
$\left(4ab^2\:+\:6xy\:^3\right)^2$
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