$\:\left(-9-7\right)\:-\left(9-1\right)=\:$
$2x\frac{dy}{dx}-y=x^2$
$\frac{dy}{dx}+2y=x$
$lny=ln\left[\left(x^5+2\right)^2\left(x^3+4\right)^4\right]$
$-7-9-\left(-7\right)$
$\int\frac{3x-2}{x^2-4x-5}dx$
$\left(10x+9\right)^2$
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