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The given equation is f(x) = 3x - 6.

To find f(x), substitute x with the given value in the equation.
f(x) = 3(2) - 6 = 6 - 6 = 0.
Therefore, f(x) is equal to 0.

The domain of f(x) is all real numbers because there are no restrictions on the value of x in the equation f(x) = 3x - 6.