$\lim_{x\to infinitp}\left(\frac{x-2x^2}{2x^2+5x}\right)$
$\frac{9\left(x-1\right)}{4}$
$\frac{x+1}{x^2-1}$
$\frac{t-2}{t-1}-\frac{3}{1-t}+\frac{t}{1-t}$
$x^2y^2+x^2+y^2=1$
$\left(-2\cdot8\right)\cdot8+\left(-25\right)$
$\:\left(3x\:+\:2y\:+\:5z\right)\:-\:\left(8x\:+\:2y\:+\:3z\right)\:$
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