TRUMP IS A RACIST ORNAGE DRAG HIM OUTA THE WHITE HOUSE JANUARY 20TH! Why is white supremacy even a thing

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?

Solve this 364x-64x=300x and 12(x2–x–1)+13(x2–x–1)=25(x2–x–1)

Me on this i beg you on this to answer!