$\lim_{n\to\infty}\left(\frac{3^{n-1}}{3^{n-1}+1}\right)$
$\frac{2^6\cdot3^5\cdot2^5\cdot3^2\cdot5}{2^4\cdot3^6\cdot2^5}$
$8a^2+2a-1$
$\left(5m^4+11\right)^2$
$27xy-72x$
$\left(+c\right)\left(x+3\right)$
$-6y-3+2x+3x+\:2y-8-x-5y+4$
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