$y^2-9y+2$
$\left(-3\right)\cdot\left(+5\right)-3\cdot\left(11+3\cdot\left(5-11\right)\right)$
$\frac{x-2}{x^2-4x}$
$\:\:n\:2\:+\:n\:-\:20\:=\:$
$x^2+x^2-x+3x\:+\:2-5$
$\frac{4}{3}x+y=-1$
$\int_0^2\left(\frac{\left(215x^8+162\right)}{180x^8}\right)dx$
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