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Let f(x) = -2x + 7 and g(x) = -6x + 3. Find f.g and state its domain.

-14x^2 + 36x - 18; all real numbers

12x^2 - 48x + 21; all real numbers

-14x^2 + 36x - 18; all real numbers except x = 7

12x^2 - 48x + 21; all real numbers except x = 1