$a+b+b-a$
$\lim_{x\to-\infty}xln\left(\frac{x}{1+x}\right)$
$\frac{m}{10}=33$
$x^2+x+30=0$
$n^2-7n+12$
$\int\frac{\sqrt{x}+3x^4}{2x^2}dx$
$\lim_{x\to0}\left(\frac{\sqrt{64+8x-\sqrt{64-8x}}}{x}\right)$
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