$\frac{18}{m+1}=2$
$\lim_{x\to3}-\left(\frac{x-3}{2-\sqrt{x+1}}\right)$
$\left(9a+11b\right)\left(9a-11b\right)$
$7\left(3x-2\right)=28$
$\left(\frac{1}{2}x+2y\right)^3$
$\left(3x^2\right)\left(x+3\right)$
$\lim_{n\to1}\left(\cos\left(\frac{n}{\pi}\right)\right)$
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