$\left(-286\right)+\left(-485\right)+36$

$\log_{10}\left(y\right)-2\log_{10}\left(y-1\right)$

$\left(5xy-2\right)^2$

$7\sqrt{x}+\sqrt{y}=7$

$\frac{\left(3xy\right)^{-\frac{1}{4}}}{wz}^{\frac{2}{3}}.\frac{\left(wx\right)^{\frac{1}{5}}}{3yz}^{\frac{3}{2}}$

$2y=-1x-8$

$\left(b-9\right)\left(b+2\right)$