$11-7-9+3+7$
$6x-y=3$
$ab^{-2}=\:\frac{a}{b^2}$
$\left(+55\right)\:-\:\left(-97\right)\:$
$-3\cdot\:\left(-5\right)\cdot\:\left(-1\right)\cdot\:5$
$5^5\cdot7^5$
$\frac{3}{x+2}\leq4$
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