$\left(10x+4y-7z\right)+\left(20x+9y-4z+10\right)$

$\log\left(x-2\right)+\log\left(x-3\right)=\log6$

$-2sinx+cos2x=1$

$\sqrt[\frac{1}{8}]{\sqrt[16]{36a^2b}}-2\sqrt[6]{\sqrt[\frac{1}{3}]{25a^2b}}+5\sqrt[\frac{1}{4}]{\sqrt[8]{49a^2b}}$

$\frac{\left(x+6\right)^2\:-\:\left(x-6^2\right)}{3x}$

$x2+\frac{x^2}{3}$

$3x\frac{2}{5}$