$3d^{-4}\cdot3d^5$
$x^2-2x-5>3$
$\frac{y^6}{y^{-10}}$
$x.x.x$
$7x+7y$
$85\:-\:\left(-90\right)\:+\:\left(-155\right)\:-\:\left(-8\right)\:+\:50\:-\:20$
$\int\sqrt{4x-6}dx$
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