$\frac{5+x}{5-x}\le\:\frac{-1}{5}$
$16p^4-81q^4$
$48x^3y^2+72x^2y^3+60xy$
$\int8xe^{-3x}dx$
$12\sin\left(x\right)^2-9$
$\frac{16x^5-40x-x^3+16}{x+4x^2-6}$
$x^2-4\le0$
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