{A pack of playing cards} is a set.

$\left\{x|x\in N, x+7=8\right\}$ is a singleton set.

If $A=\left\{x|x is a letter of the word \text{'}TERROR\text{'}\right\}$, then $n\left(A\right)=6$

$\left\{x|x\in N, 4<x<5\right\}$ is a finite set.

$\left\{x|x\in Z, 2x-1=0\right\}=\varphi$

$\left\{\frac{1}{3}, \frac{{\displaystyle 1}}{{\displaystyle 5}}, \frac{{\displaystyle 1}}{{\displaystyle 8}}, \frac{{\displaystyle 1}}{{\displaystyle 9}}, \frac{{\displaystyle 1}}{{\displaystyle 11}}\right\}$ and $\left\{x|x\in N and 4\frac{5}{8}<x<10\right\}$ are equivalent sets.

If $P=\left\{letter in the word \text{'}READ\text{'}\right\}, Q=\left\{letter in the word \text{'}DEAR\text{'}\right\}$, then $P=Q$