$\frac{6x^2-5}{x^2-1}$
$\frac{y^3-1}{y-1}$
$-x^2+6x-2$
$4xy'+1=2y$
$\left(6a\:+\:7x\:+\:z\right)^2$
$\int\pi dn$
$-683\:+\:-875$
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