$-y^2-y^2$
$\left(x^4-1\right)\left(x+1\right)$
$144x^2+24xyz+y^2z^2$
$\left(7u+8\right)-\left(4u+8\right)$
$\lim_{x\to0.95}\left(\frac{4x^2-x-3}{x-1}\right)$
$125-75+y+15y^2-y^3$
$16a^2-81b^2$
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