$x-5<9-x$
$\csc\left(b\right)\sec\left(b\right)=\cot\left(b\right)+\tan\left(b\right)$
$15+2a-a^2$
$\frac{9x^2-127}{6x-18}$
$3x^2-6x+x^2-2+5x-8$
$xy-y=y^3$
$\left(x^2y-3y\right)y^1+xy^3=0$
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