$6+-z^2+8-7z^2$
$\lim_{t\to0}\left(1+t\right)^{\frac{1}{t}}$
$4x^2-12z$
$\left(-2x+3\right)\left(3x-1\right)$
$x+11=-23$
$8x^4+72x^2+162$
$49m^2-169n^2$
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