$\left(y^2-3y\right)\left(y^2+3\right)$
$-9+7+3-5-9+14+16-17-2-5$
$x-6\sqrt{x^2}+5x-66$
$\lim_{x\to-1}\frac{x-6}{x+1}$
$15x+8-5x+5y-3+8y+2x-3y$
$-5m+10$
$4z^2+4z-4$
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