$121s^2-25t^2$
$m^8-\frac{4}{4}m^4$
$f^2\:+\:8f\:$
$4-2x>x-5$
$-4x^5y^3\left(-2x^2y^2\right)$
$\left(-2\right)^5\cdot\left(+5\right)^5$
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