$\frac{\sqrt{b}-\sqrt{a}}{2b^2-2a^2}$
$-3\left(x\:-\:1\right)\:+\:8\left(x\:-\:3\right)$
$3mn+4m+6m-2n+3m$
$\frac{4x^2+18x+14}{x+3}$
$-x^3-6x^2$
$4cos^2x+cosx-5$
$\frac{x}{x-3}\le-1$
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