$2n-4=2$
$\left|-3\right|+7$
$x^2-5x-36=0$
$4tan\left(x\right)+4=0$
$\frac{4}{3}x^7+\frac{2}{9}x^5-\frac{8}{27}x^8$
$\left(2x+y\frac{2}{y}\right)$
$\frac{b^4-1}{1+b^2}$
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