$\frac{8x^3+y^3}{2x+y}$
$\left(2x^4-7\right)^2$
$\left(\frac{3}{5}m^4+7n^3\right)\left(\frac{3}{5}m^4-7n^3\right)$
$3^6\cdot3^{-6}$
$t^2+14t=-39$
$6y^{-4}$
$54.87+7.48$
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