$\left(7p^6+9r^2\right)^2$
$-\frac{3}{7}m^2n\cdot\frac{7}{2}a^2m^3$
$w^4+2w^2+9$
$x^2y^2-2x=3$
$16+4x^6$
$\sqrt{\frac{x}{x+2}}$
$2\left(\frac{1}{2}x^{\frac{-3}{2}}\right)$
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