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The 'divina proporzione' or golden ratio, represented by the Greek letter phi, is derived from the equation below where $a$ and $b$ are parts of a line.


i.e. $ \frac{a+b}{a}=\frac{a}{b}=\Phi\ \quad $(phi)

If $b = 1$ show that $\Phi = a = (\sqrt 5 + 1 )/2 = 1.618034...$.

In the following equation what does $x$ equal?