$\lim_{x\to0}\frac{x}{4-\sqrt{x+16}}$
$\frac{3x^3y^6}{5}\left(\frac{y}{7}-y\frac{x^3}{1}\right)$
$x^2-12x=1$
$59.89-73.91-51.43+5.67+27.39+89.86$
$-k^3+2k^2+k-2$
$12mn^3-7mn^3+mn^3+6m^3n+2m^3n$
$-8a+\:2a$
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