$3x^2y-24xy+48^2$
$-16-9^2$
$50tu2+49tu2+42tu2+18tu2+tu2$
$9x^2-18x-36$
$-a\:\left(-c\:+\:6bc\right)$
$\sqrt{169}-24$
$\left(6^9\right)^{-5}$
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