$256\:a^{16}-81\:b^4$
$2\left(5-x\right)^2\left(3\left(4-2x\right)+2\left(5-x\right)\right)$
$\sqrt{2x+1}+1=x$
$800+-468$
$7x^2-44-35$
$\lim_{x\to1}\left(\frac{-2x^2+2}{sen\left(\pi x\right)}\right)$
$x^2-2x-1=0$
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