$b^2+7b=8$

$\lim_{x\to1}\left(\frac{\sqrt{x^3+x-1}-1}{\sqrt[3]{x^2+7x}-2}\right)$

$-y^2dv+y\sqrt{v}dy=0$

$\left(x^3y^3\right)dx+\left(x^3y^2\right)dy=0$

$\frac{d^2}{dx^2}\left(x\cdot\cos\left(2x\right)\right)$

$\frac{dy}{dx}+\frac{y}{x+4}=5$

$43+13+1+\left(-10\right)$