$6x+18=90$
$-60\:+\:5\:+\:-1\:+\:93\:+\:46$
$\left(m+\frac{3}{2}n\right)\left(m-\frac{3}{2}n\right)$
$\left(y^{-1}+y^{-2}\right)\left(9y^{-3}-10y^{-4}\right)$
$\sqrt{36x}$
$\sqrt{7\left(\pi-\sqrt{5}\right)}$
$\:3am^2+3bm^2-2an^2-2bn^2$
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