$\frac{x^2-6x+40}{x^2+16x-48}$
$\left(x^{a+1}\right)\left(y^{x-2}\right)^2$
$\:43.89-3.74$
$-10+2-4+5+5+7-2+4-1-9$
$\left(9-b\right)^2$
$\left(4x^2-\frac{8}{3}x+\frac{4}{9}\right)\left(-2x+\frac{2}{3}\right)$
$\sqrt[3]{x^4y}$
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