$a2+a-7+2a+5$
$xy'+y=x+x^3$
$\left(1+2t\right)^2$
$3x+2+9+4x+1$
$\frac{dy}{dx}=\frac{4x^3+1}{2y-6}$
$\left(5x^4-\frac{1}{3}x^6+8x^5\right)^2$
$\lim\:_{n\to\:\infty\:}\left(\frac{n^2+1}{n^3+n^2-n+1}\right)$
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