Let f(x) be continuous and differentiabl...

Let f(x) be continuous and differentiable function for all reals and f(x + y) = f(x) - 3xy + ff(y). If `lim_(h to 0)(f(h))/(h) = 7`, then the value of f'(x) is

`-3x`

`-3x + 7`

`2f(x) + 7`

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