$\lim_{x\to0}\left(\frac{3x^3}{e^{2x}}\right)$
$\frac{9x^2+5}{3x}$
$\frac{1}{2}x^3+2^3$
$\int_0^{\infty}47.7e^{-x}dx$
$\frac{2x+3y}{2x+3y}$
$54-\:-4$
$2x\le x-5$
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