What for bother about the order of functions?

Algebra Level pending

Let \(f(x) = 2x^2\) and \(g(x) = x-1\). If the value of \(x\) that satisfies \(fg(x) = gf(x)\) can be expressed as \(\frac{a}{b}\) where a and b are positive coprime integers, \(a+b =?\)

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