$\sqrt[3]{81x^2y^4}$
$+75+20-40-20+50-8+5$
$\left(\frac{4}{5}x^2+4x^{\frac{2}{3}}\right)\left(\frac{4}{5}x^2-4x^{\frac{2}{3}}\right)$
$431-\left(-587\right)$
$18x^2+6y^2=20$
$\frac{7x-56}{5x^2-320}$
$2w-6$
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