$\lim_{x\to0}\left(e^x+6x\right)^{\frac{6}{x}}$
$\frac{2x+5}{-4x+8}$
$\left(8x+5y=47\right)\left(2x-6y=-10\right)$
$\frac{3x^8-6x^2+5x}{x+2}$
$-4x-400$
$\int\frac{4x+4}{2x^2+4x+5}dx$
$7\:\cdot\left(9+5\right)$
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