$-8v+7\left(10-6v\right)$
$\frac{4s^{-5}}{7s^3}$
$-6\left(-2\right)+3$
$\left(-81\right)\::\:\left(-9\right)\:\:$
$\left(-2.5a^2b\right)^3$
$\frac{64n^1-m^1}{4n-m}$
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