$a^2\cdot a^{-5}$
$\sqrt{2x-7}=13$
$2^4+12-4^2$
$12r-6-12r$
$^{9\:x\:9^5}$
$\frac{dy}{dx}+y^{2\:}-y=0$
$\frac{1-2\sin^2}{\cos\left(x\right)-\sin\left(x\right)}$
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