^3log2
{(x-y)/6}$ ^2 $
( $P^{21}$ $Q^{-15}$ $r^{-3}$) $\frac{1}{5}$
3^log2
3log2
x2+14x+49
1+ $0.2^{2}$- $0.2^{3}/6$-0.2
2^-1
3x=9x-18
find the x and the RHS