$\frac{a^{\frac{1}{2}}}{a^{\frac{1}{2}}}$

$-4.\left(-3\right)+-\left(3\right).\left(-2\right)-12:\left(-3\right)$

$\frac{2x}{5-x}=\frac{15-2x}{x}$

$\frac{dy}{dx}=\frac{\left(-4y+x^3\right)}{x}$

$\left(9r^2w^4\right)^4$

$\frac{8a^3-1}{2^2+1}$

$\left[-5-\left(\frac{9}{7-10}\right)\right]3.9+9\left(-9\right)$