$\frac{8}{8^{-5}}^{-3}$
$-8x+15\le-7x-36$
$\frac{cos2x}{sinx}=cosx\:cotx-sinx$
$-12^8-6x^4+6x^3by3x^3$
$\frac{8x+16}{4x^2-16}$
$5-\frac{3}{4}x>=-4$
$-9x+7-2y-4x-8y$
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