$\left(4z-2\right)\left(3z+3\right)$
$x+68\ge75$
$\int\frac{50x}{x^2+12}dx$
$\left(2x-1\right)dx+\left(x^{2+8xy^3}\right)dy=0$
$\lim_{x\to0}\left(\frac{x-6}{x}\right)$
$\int\left(2t+1\right)\ln t\:dt$
$\int18xedx$
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