$\lim_{x\to0}\left(\frac{x^2-3x-4}{x-4}\right)$
$\int\frac{2}{\left(2t-4\right)^2+4}dt$
$6\:-\:\left(-19\right)$
$x+y-4x-6y$
$\lim_{x\to0}\left(1+\frac{2}{x^5}\right)x$
$\int-\left(x^2+1\right)\left(-x^2-2x+1\right)dx$
$-7m-4>26m-94$
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