PLS HELP ASAP Step 3

To solve for x, subtract 6 from each side of the equation and simplify.
x + 6 - 6 = +3V2 - 6

X = -6+- _

Therefore, the solutions are as follows. List both the exact solution and its approximation rounded to two decimal places.
X = _ = _(smaller value)
X=_=_(larger value)

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?