-12x+6<-2-10x Help me!!! Urgent

-2x+6(greater than or equal to) 3x-34

5x-(x-2) (greater than it equal to) 2x-4(x-8)

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?