How many solutions does the equation 3n + 5 (n-4) = 9n -5 have

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

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?

(x-5)1/2+5=2 what is a possible solution?