$x^2+14x+9$
$35+30x-45z$
$2u-5=5$
$\lim_{x\to\infty}\left(\frac{\ln x}{x-1}\right)$
$2x^4\:+\:6x^3\:+\:4x^2$
$y''+36y\:=0$
$\frac{dy}{dt}=2+t$
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