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f(x) = (f + g)(x) - g(x)
=> f(x) = (x^2 + 3x) - (x^2 - 5x + 2)
=> f(x) = x^2 + 3x - x^2 + 5x - 2
=> f(x) = 8x - 2
F(x) + g(x) = x^2+3x
f(x) + x^2 - 5x +2 = x^2+3x
f(x) = x^2 + 3x - x^2 + 5x -2
f(x) = 8x - 2