I need the answer to this ASAP

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

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 possible solution of this equation