$\left(xy^4\right)^4$
$2x+5=x+2$
$c-4=-9$
$\frac{2}{x^2-1}+\frac{x}{x-1}-\frac{x}{x-1}$
$e^x=0$
$\left(\frac{x+1}{x^2-4x}\right)$
$7a^2-7b^2$
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