$\int_0^4xe^{-\frac{x}{2\:}}dx$
$\lim_{x\to\infty}\left(\frac{5x+sinx}{2x}\right)$
$y=9x^2-3x-1$
$\left(c-6d\right)^6$
$\log9\left(x-3\right)+\log9\left(x+3\right)=1$
$4x-52$
$\:-x^2+4x-7=0$
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