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3x = a + 1
x = ( a + 1 )/3
9x² - 3x - 1 = 0
9 { (a + 1 )/3 }² - 3 . (a + 1 )/3 - 1 = 0
9 ( a² + 2a + 1 )/9 - a - 1 - 1 = 0
a² + 2a + 1 - a -2 = 0
a² + a - 1 = 0
x² + x - 1 = 0