$\frac{u}{7}-1.5=-23.9$
$2x+y;\:x=7;\:y=10ab$
$-4\left(6\:+\:a\right)=-44$
$y^2-81$
$xy'=1$
$cscx=\frac{1+secx}{sinx+tanx}$
$\left(2y+3yab\right)\cdot\left(2y-3yab\right)$
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