$1+2+3+4+5+6+7+8+9+10+11+12+13+14+15$
$-17+x=-19$
$3xy^2\frac{dy}{dx}=6x^2y+3y^3$
$25x^2+9y^2+200x+175=0$
$\int_5^6\frac{e-\sqrt{x-5}}{\sqrt{x-5}}dx$
$\binom{\:n}{k}\cdot\:\binom{\:k}{r}$
$\int\frac{2x^3+x^2-2x-7}{x^2-x-2}dx$
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