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(f - g)(x) can be found by subtracting the two functions f(x) and g(x).
(f - g)(x) = f(x) - g(x)
= (-2x^2) - (-2x^2 - 3x)
= -2x^2 + 2x^2 + 3x
= 3x
So, (f - g)(x) = 3x.