$\left|\left(k+1\right)^2-\left(k-2\right)^2+\left(k+5\right)^2-\left(k+7\right)^2-\left(k+3\right)^2\right|$

$\frac{-1}{v}=\frac{v+5}{50}$

$2x+5=x+3$

$\frac{dy}{dx}=\frac{x^2-3}{y^2}$

$\left(y^6\right)^{-3}\cdot y^{21}$

$2\int_{\infty\:}^e\frac{ln\left(x\right)}{x}\:dx$

$-12-\left(-15\right)+3$