$6x^2-4y$
$25x^{7}-10x^{5}+15x$
$\frac{3x^6+x^4-x^2-3}{x+1}$
$12x^2y-24x^3z$
$x^2+9<0$
$\lim_{x\to0}\frac{4x^3+2}{\pi x^2-5x^3-1}$
$\frac{h}{5}=5.1$
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