Answer each of the following questions yes or no, and add up the numbers corresponding to the questions for which the answer is yes. For instance, if the answer to all six questions were 'yes,' then the answer would be $1+2+3+4+5+6=21$.

1. Is $\frac{2}{3x}$ equivalent to $\frac{2x}{3}$?

2. Is $\frac{1-h}{2h}$ equivalent to $\frac{h-1}{2h}$?

3. Is $-(u+u^2)$ equivalent to $-u-u^2$?

4. Is $-(3+y)$ equivalent to $-3+y$?

5. Is $\frac{j}{2}$ equivalent to $\frac{1}{2}j$?

6. Is $x+y+z$ equivalent to $y+x+z$?