$4-25x^2=0$
$x-5y=-15$
$k^2-k-30$
$\left(\frac{1}{8}x^2+\frac{3}{2}\right)^2$
$\lim_{x\to0}\left[\frac{1}{8e^x}-\frac{1}{8x}\right]$
$\frac{dx}{\left(1+x^2\right)}+\frac{dy}{\left(1+y^2\right)}=0$
$8a-\frac{5b}{2}-\frac{3c}{5}$
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