$a^2+-44a+484$
$x\:-\:3x\:-\:4x\:$
$3x^2-12x+9$
$\frac{-2x^3+12x-4}{x-2}$
$y^{-2}\left(-y^{-3}\right)^{-3}$
$546\cdot0.18$
$\frac{y^{-2}}{6y^5}$
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