$\left(13+m\right)\left(13-m\right)$
$44pq+36+12-48$
$\left(2a^2+a-3\right)^2$
$8x+y+z+u-3x-4y-2z+3u+4x+5y+3z-4u-9x-y+z+2u$
$x^2+24x+64$
$\log_{49}\left(7x+13y\right)=0.5+\log_{49}\left(2y\right)$
$\sqrt{\log_{10}\left(n\right)}=2$
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