$8sin\frac{\pi\:}{48}cos\frac{\pi\:}{48}cos\frac{\pi\:}{24}cos\frac{\pi\:}{12}$
$\log_{13}\left(n-9\right)=\log_{13}\left(-2n-6\right)$
$16x+26xy-50z$
$xy'=y+2$
$2x+3x-4r+55r$
$3x+5x-2x-9x$
$5x+8x$
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