What are the answers

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

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?