$\frac{2}{z}=\frac{-3}{z}-1$
$\left(y+11\right)\left(y+2\right)$
$3c-9d+7c+5d$
$2x+3y=11$
$y^3=9-x$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{senx-1}{cosx}\right)$
$81 u ^ { 4 } - 18 u ^ { 2 } w ^ { 3 } + w ^ { 6 }$
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