What is the value of x in this hexagon?

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?

Which graph represents the same relation is the sa which graph represents the same relation as the set {(-3-2)}