$x^7z^7+sin\left(y^2z^7\right)=2$
$\frac{x}{3}-21=12$
$13g^{-3}$
$2-2+2-2$
$mn^2\left(n^2+2m-5m^2\right)$
$\lim_{x\to0}\frac{1+\cos\left(\pi x\right)}{x^2-2x+1}$
$1-8x=4x^2$
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