$11f^2+17f-9+19-12f^2$
$8-\left(5x+2\right)=-5x-6$
$x\left(x-4\right)<0$
$-9-\left(-5\right)+\left(-11\right)-\left(-12\right)+5-\left(-7\right)$
$\frac{8}{2}-5$
$3.5x\:-\:y\:+\:5.5x$
$\lim_{x\to\infty}\left(\frac{x^2-3x+2}{-x^2+7x-10}\right)$
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