$81-25x^2$
$\frac{\left(-2m^2n^5\right)^4}{\left(12m^3n^5\right)^3}$
$\left(4x^2+3\right)\left(4x^3-8\right)$
$\frac{2x+3}{x^3+2x^2-2x}$
$\left(x^2y^2\right)\left(x^2y^2\right)$
$-x^2-6x+16$
$6xy\sqrt[6]{x^4y^5z}\:.\:4\:\sqrt{9x^3yz}$
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