Solve for a
a = \frac{7 {(\sqrt{5} - 1)}}{2} \approx 4.326237921
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a=\frac{7}{2}\times 5^{\frac{1}{2}}-\frac{7}{2}
Multiply both sides of the equation by 7.
a=\frac{7}{2}\sqrt{5}-\frac{7}{2}
Reorder the terms.
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