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![\sqrt[3]{27x^{-n}y^{12}} = \frac{3y^4}{x^7}](http://s0.wp.com/latex.php?latex=%5Csqrt%5B3%5D%7B27x%5E%7B-n%7Dy%5E%7B12%7D%7D+%3D+%5Cfrac%7B3y%5E4%7D%7Bx%5E7%7D&bg=ffffff&fg=000&s=3 "\sqrt[3]{27x^{-n}y^{12}} = \frac{3y^4}{x^7}")
