Notation to define specific elements from multiple sets in a superset

I'm trying to come up with the proper and concise notation to denote all the elements **shown in bold red** in the following sets where T is the superset containing A,B,C,D,E. Also the elements in each set are not necessarily the same, this is just how I've written them, so the 1 in set A is not the same as the 1 in set B and so on.

T { A B C D E }

A { **1 2 3 4 5 6** 7 8 9 10 11 12 }

B { 1 2 3 4 5 6 }

C { **1 2 3 4 5 6** 7 8 9 10 11 12 }

D { **1 2 3 4 5 6** 7 8 9 10 11 12 }

E { **1 2 3 4 5 6** 7 8 9 10 11 12 }

I've come up with the following possible solutions so far but they're all probably wrong with all of them.

(x<7) ∧ ¬B

{x∈T:¬B ∧ x<7}

{x∈T:x∉B; x<7}

{x|x<7;x∉B}