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3a = 5 + /5 /:3
a = 1 2/3 + /5
3a + 3√5 - √5a - 5 = 5 + √5
3a - √5a = 5 + √5 - 3√5 - 5
a(3-√5) = -2√5 / 3-√5
a = (-2√5) * (3+√5) / (3-√5)(3+√5)
a = -6√5 - 10 / 9 - 5
a = -6√5 - 10 / 4