$\frac{dy}{dx}=\frac{x^5y}{\left(lny\right)^5}$

$\int\left(-x^2\cdot\:\left(e^{\left(-3x\right)}-4\right)\right)$

$\left(3\right)\cdot\left(-1\right)+\left(-17\right)-\left(15\right)\cdot\left(2\right)$

$15y^2+20y^2-5y$

$4x^2-12x-9$

$\frac{1}{\left(x+20\right)^2}$

$\left(7y^4+6\right)^2$