$6\:x\:\left(-21\right)$
$\int\left(\frac{x^2}{\left(x-1\right)}\right)d\left(x^2-1\right)$
$12y+13=13$
$\int15xsec^2x\:dx$
$5x+7\ge7x+19$
$-9-17-\left(-5\right)$
$25x^2-y^2z^4$
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