$\lim_{x\to0}\left(\frac{2}{x}-\frac{1}{e^{3x}-1}\right)$
$3a-2=7$
$9x^2-y^4$
$4x^2+16x-16$
$panama$
$\log_x\left(\frac{x-4}{x^2-4}\right)$
$\int\left(x-6\right)\left(2x+1\right)dx$
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