$\frac{-18}{6}-\frac{-20}{-4}$
$-3x-3x^2$
$\lim_{x\to\infty}\left(-\frac{83}{97}\right)^x$
$\int\frac{1}{\left(x-1\right)^2\left(x+4\right)}dx$
$3x-2<7$
$-27\::\:-9\:$
$-11y\:+\:9y\:=\:4$
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