Use the delimiters \( and \) for in-line equations, and \[ and \] for displayed equations. See http://docs.mathjax.org/en/latest/input/tex/delimiters.html ↗.
Re: What's wrong with: \dfrac{8x^{24}}{x^{20}}=8x^{4}
ó $a->name - $a->date
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