$4n-2+7n=20$
$\lim_{x\to\pi}\left(\frac{\sin\left(x\right)^2}{1+\cos\left(x\right)}\right)$
$\:73\:+\:\:4\:x\:\le\:225$
$\frac{w-5}{w^2-25}$
$v^2-36$
$216b^3+1000c^6$
$9\left(a-b\right)^2$
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