What is this |7| = suppose to mean

7

Step-by-step explanation:

|7|

The bars on the outside means absolute value

It means calculate what is on the inside and then take the positive value

The positive value of 7 is 7

If we had | 3-7| We would find 3-7 = - 4 then take the positive value = 4

It is meaning basically the absolute value.