$n+5\cdot n+7$
$3\cos\left(13x\right)=1$
$y^2-\frac{9}{y}+3$
$9n-3+9n+3$
$13+9\:<-21$
$10^0+10^1+10^2+10^3+10^4$
$\frac{x^4-n^4}{x+n}$
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