$-x^3-15x^2-15x-125$
$s+7>19$
$\left(\sqrt{13}+1\right)\left(\sqrt{13}-1\right)$
$40.575\:\cdot16.23$
$\frac{5}{y+3}-\frac{4}{3y}=\frac{7}{y^2+3y}$
$\left(3z^2+2w\right)^2$
$g^2-26fg+169g^2$
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