$5x^2-15x+10$
$5x^2y-8xy^2-9y^3;\:x=2;\:y=-1$
$9r-17=19$
$-21x^2+11x-2$
$\frac{5}{2x-3}-\frac{2}{2x+1}+\frac{4x}{14x^{2\:}}$
$\lim_{x\to2}\left(\frac{x+4}{x^2-2}\right)$
$\frac{-b}{3b-8}=\frac{1}{b-5}$
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