$36h^{4}-64$
$\frac{x+7}{7}$
$512-27a^9$
$x^2-x\cdot y+y^2\cdot\left(\sqrt{x^3+y^3}\right)$
$\left(4-4m\right)^2$
$\left(2y^{a+4}-8y^{a-1}\right)^3$
$\frac{4}{x}-\frac{x}{5}$
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