To solve this equation, we need to isolate x.

First, let's distribute the 6 to both terms inside the parentheses:

Cos п(х) + Cos п(2) = 12

Now, substitute the value of Cos п(2), which is -1:

Cos п(х) - 1 = 12

Now, add 1 to both sides to isolate Cos п(х):

Cos п(х) = 13

To find the value of x, we need to determine the angle whose cosine is 13. However, since the cosine of an angle can only range from -1 to 1, there is no real solution to this equation.