$20\:.\:-9$
$\left(-6\right)\:+\:\left(-12\right)\:-\left(-15\right)\:-\left(3\right)$
$5\left(4x-1\right)$
$4m+-10$
$\left(\frac{625}{a}\right)\left(\frac{a^3}{125}\right)$
$4-1-5$
$\frac{x+1}{x-3}<2$
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