$\frac{30x^3-15x^2-10x-100}{5x}$
$\frac{6x^2+5x-6}{15x^2-7x-2}$
$\frac{6-2x}{3+x}>2$
$25a^{12}-100x^4b^{10}$
$-x-4x-7$
$\tan^{-1}\sqrt{4}$
$z^2-y^2$
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