$\frac{x^2-3}{x^3+3x^2+3x+1}$
$a=-3x^2+2x-1$
$-x\sqrt{75x}$
$x^2+y^2-64=0$
$\frac{11-3}{1}+\frac{6-4}{\frac{1}{2}}+5a$
$\frac{x^2+4x^2+7x+8}{x^2}$
$\left(z^5+z\right)\left(-2z+1\right)$
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