$\left(a^5\right)^{-1}$
$8y-5y+2y$
$\lim_{x\to0}\left(\frac{2x^2\:-2x\:}{x\:-\:2}\right)$
$\frac{4r^4}{\left(4r\right)^3}$
$-423+164$
$10\cos x-3=2$
$x^2-2x-12$
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