$-10\left(-20\right)$
$+\left(+8\right)-\left(+15\right)b+\left(-2\right)+\left(-16\right)$
$\:\int\frac{9}{x^4-81}dx$
$9x^2-36x-36$
$7^{3.9}$
$2xy-9x^2+\left(2y+x^2+1\right)\frac{dy}{dx}=0$
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