$3\left(x-2\right)=18$
$\lim_{h\to0}\left(\frac{\left(a+h\right)^4-a^4}{h}\right)$
$\left(6p-4\right)+\:\left(p^2-1\right)$
$8.1+7-11.3-2.8+6-17-9+3$
$x^2-4x-1=0$
$\lim_{x\to0}\left(\frac{x^2}{x-4}\right)$
$23y+27y+-31y$
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