$\frac{x^2-16}{x-3}$
$m^2.2m^{-3}$
$m^2+6m-m^3+m^4$
$2x+3=3x$
$5^4.5^{-6}$
$-2^3+\left(-3\right)$
$\left(-51\right)\cdot\left(-97\right)$
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