$\frac{x^2+2x-15}{x-1}$
$\int\frac{\left(4x^2\:+8x\right)}{\left(x-4\right)\left(x+2\right)^2}dx$
$18x^5y^4z^7\cdot12x^6yz^4$
$\frac{4a^2b^4-64n^8}{2ab^2-8c^4}$
$\frac{x^{2}-2}{x^{2}+2}$
$5n+2m-8n+3m$
$\frac{20x^4y^3z}{-5x^2y^2}$
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