$\left(+20\right)\:-\left(-2\right)$
$8^2\cdot\left(8^{12}\right)^{-2}$
$\sqrt[6]{9^6}.\:3^{12}$
$x-42=13$
$4x^2-24x+32$
$\left(\sqrt[4]{97-x}+\sqrt[4]{x}\right)^4$
$\left(\frac{x}{7}-\frac{y}{2}\right)^2$
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